diff --git a/src/commands/create.ts b/src/commands/create.ts
index a9d6d6a..e657199 100644
--- a/src/commands/create.ts
+++ b/src/commands/create.ts
@@ -1,7 +1,7 @@
 import { Command } from "commander";
 import { checkbox, select, input } from "@inquirer/prompts";
-import { resolve, basename } from "node:path";
-import { writeFile } from "node:fs/promises";
+import { resolve } from "node:path";
+import { writeFile, mkdir } from "node:fs/promises";
 import { resolveSource } from "../lib/config.js";
 import { loadIndex } from "../lib/index-loader.js";
 import { inferRepoUrl, cloneBlock, cleanupTemp } from "../lib/git.js";
@@ -15,13 +15,11 @@ interface SelectedBlock {
   variantLabel: string;
 }
 
-const STYLES: { value: string; label: string }[] = [
-  { value: "standard", label: "标准多模块 — 根 pom.xml 聚合所有积木子模块" },
-  {
-    value: "bom",
-    label: "BOM 模式 — 根 pom + bom 子模块统一依赖版本管理",
-  },
-  { value: "simple", label: "简单模式 — 不生成根 pom，积木模块平铺" },
+const APP_STYLES: { value: string; label: string }[] = [
+  { value: "mvc", label: "MVC 经典三层 — controller / service / mapper" },
+  { value: "ddd", label: "DDD 四层 — interfaces / application / domain / infrastructure" },
+  { value: "biz-api", label: "biz/api 分离 — api 接口层 + biz 实现层" },
+  { value: "simple", label: "极简 — 只生成 Application 入口类" },
 ];
 
 const AI_TOOLS: { value: string; label: string }[] = [
@@ -51,182 +49,193 @@ export function registerCreate(program: Command): void {
 }
 
 async function runCreate(projectName: string): Promise<void> {
-      const cwd = process.cwd();
+  const cwd = process.cwd();
 
-      // 1. Load index
-      const source = resolveSource();
-      console.log(`[1/7] 拉取积木索引...`);
-      const index = await loadIndex(source);
+  // 1. Load index
+  console.log("[1/8] 拉取积木索引...");
+  const source = resolveSource();
+  const index = await loadIndex(source);
 
-      if (index.blocks.length === 0) {
-        console.log("没有可用的积木。");
-        return;
-      }
+  if (index.blocks.length === 0) {
+    console.log("没有可用的积木。");
+    return;
+  }
 
-      // 2. Interactive prompts
-      // 2a. Select blocks
-      const chosenNames = await checkbox({
-        message: "选择要集成的积木（空格选择，回车确认）:",
-        choices: index.blocks.map((b) => ({
-          name: `${b.name} — ${b.description}`,
-          value: b.name,
-          checked: true,
+  // 2a. Select blocks
+  const chosenNames = await checkbox({
+    message: "选择要集成的通用模块:",
+    choices: index.blocks.map((b) => ({
+      name: `${b.name} — ${b.description}`,
+      value: b.name,
+      checked: true,
+    })),
+  });
+
+  if (chosenNames.length === 0) {
+    console.log("未选择任何积木，已取消。");
+    return;
+  }
+
+  const chosenBlocks = index.blocks.filter((b) => chosenNames.includes(b.name));
+
+  // 2b. Resolve dependencies
+  const resolved = resolveDeps(chosenBlocks, index.blocks);
+  if (resolved.added.length > 0) {
+    console.log(
+      `  自动补全依赖：${resolved.added.map((b) => b.name).join(", ")}`
+    );
+  }
+
+  // 2c. Select variants
+  const selected: SelectedBlock[] = [];
+  for (const block of resolved.all) {
+    let branch = block.defaultBranch;
+    let variantLabel = block.defaultBranch;
+
+    if (block.variants.length > 1) {
+      const chosen = await select({
+        message: `为 ${block.name} 选择变体:`,
+        choices: block.variants.map((v) => ({
+          name: `${v.label} (${v.branch})`,
+          value: v.branch,
         })),
+        default: block.defaultBranch,
       });
+      branch = chosen;
+      variantLabel = block.variants.find((v) => v.branch === chosen)?.label ?? chosen;
+    }
 
-      if (chosenNames.length === 0) {
-        console.log("未选择任何积木，已取消。");
-        return;
-      }
+    selected.push({ block, branch, variantLabel });
+  }
 
-      const chosenBlocks = index.blocks.filter((b) =>
-        chosenNames.includes(b.name)
-      );
+  // 2d. Business module style
+  const appStyle = await select({
+    message: "选择业务模块风格:",
+    choices: APP_STYLES,
+    default: "mvc",
+  });
 
-      // 2b. Resolve dependencies (auto-add missing)
-      const resolved = resolveDeps(chosenBlocks, index.blocks);
-      if (resolved.added.length > 0) {
-        console.log(
-          `  自动补全依赖：${resolved.added.map((b) => b.name).join(", ")}`
-        );
-      }
+  // 2e. Variables
+  const defaultPkg = `com.example.${projectName.replace(/[^a-zA-Z0-9]/g, "")}`;
 
-      // 2c. Select variant for blocks with multiple variants
-      const selected: SelectedBlock[] = [];
-      for (const block of resolved.all) {
-        let branch = block.defaultBranch;
-        let variantLabel = block.defaultBranch;
+  const basePackage = await input({
+    message: "基础包名 (basePackage):",
+    default: defaultPkg,
+  });
 
-        if (block.variants.length > 1) {
-          const chosen = await select({
-            message: `为 ${block.name} 选择变体:`,
-            choices: block.variants.map((v) => ({
-              name: `${v.label} (${v.branch})`,
-              value: v.branch,
-            })),
-            default: block.defaultBranch,
-          });
-          branch = chosen;
-          variantLabel =
-            block.variants.find((v) => v.branch === chosen)?.label ?? chosen;
-        }
+  const groupId = await input({
+    message: "Maven groupId:",
+    default: basePackage,
+  });
 
-        selected.push({ block, branch, variantLabel });
-      }
+  const javaVersion = await input({
+    message: "Java 版本:",
+    default: "17",
+  });
 
-      // 2d. Project style
-      const style = await select({
-        message: "选择工程风格:",
-        choices: STYLES,
-        default: "standard",
-      });
+  // 2f. AI tool
+  const aiTool = await select({
+    message: "选择 AI 工具:",
+    choices: AI_TOOLS,
+    default: "claude",
+  });
 
-      // 2e. Variables
-      const defaultPkg = `com.example.${projectName.replace(/[^a-zA-Z0-9]/g, "")}`;
+  // Summary
+  console.log("\n--- 配置摘要 ---");
+  console.log(`  项目名:         ${projectName}`);
+  console.log(`  通用模块:       ${selected.map((s) => `${s.block.name} (${s.variantLabel})`).join(", ")}`);
+  console.log(`  业务模块风格:   ${APP_STYLES.find((s) => s.value === appStyle)?.label}`);
+  console.log(`  基础包名:       ${basePackage}`);
+  console.log(`  groupId:        ${groupId}`);
+  console.log(`  Java 版本:      ${javaVersion}`);
+  console.log(`  AI 工具:        ${AI_TOOLS.find((t) => t.value === aiTool)?.label}`);
+  console.log("-----------------\n");
 
-      const basePackage = await input({
-        message: "基础包名 (basePackage):",
-        default: defaultPkg,
-      });
+  // 3. Clone blocks
+  console.log("[2/8] 拉取积木仓库...");
+  const blockDirs: { name: string; dir: string }[] = [];
 
-      const groupId = await input({
-        message: "Maven groupId:",
-        default: basePackage,
-      });
+  for (const sel of selected) {
+    const url = inferRepoUrl(sel.block.name, sel.block.repo);
+    console.log(`  clone ${url} (branch: ${sel.branch})...`);
+    const dir = await cloneBlock(url, sel.branch);
+    blockDirs.push({ name: sel.block.name, dir });
+  }
 
-      const javaVersion = await input({
-        message: "Java 版本:",
-        default: "17",
-      });
+  // 4. Apply templates — common modules under demo-common/
+  console.log("[3/8] 生成通用模块...");
+  const targetDir = resolve(cwd, projectName);
+  const commonDir = resolve(targetDir, `${projectName}-common`);
+  const vars: Record<string, string> = {
+    basePackage,
+    groupId,
+    projectName,
+    javaVersion,
+  };
 
-      // 2f. AI tool
-      const aiTool = await select({
-        message: "选择 AI 工具:",
-        choices: AI_TOOLS,
-        default: "claude",
-      });
+  const commonModules: string[] = [];
 
-      // Summary
-      console.log("\n--- 配置摘要 ---");
-      console.log(`  项目名:     ${projectName}`);
-      console.log(`  积木:       ${selected.map((s) => `${s.block.name} (${s.variantLabel})`).join(", ")}`);
-      console.log(`  工程风格:   ${STYLES.find((s) => s.value === style)?.label}`);
-      console.log(`  基础包名:   ${basePackage}`);
-      console.log(`  groupId:    ${groupId}`);
-      console.log(`  Java 版本:  ${javaVersion}`);
-      console.log(`  AI 工具:    ${AI_TOOLS.find((t) => t.value === aiTool)?.label}`);
-      console.log("-----------------\n");
+  for (const sel of selected) {
+    const moduleName = `${projectName}-common-${sel.block.module}`;
+    const moduleDir = resolve(commonDir, moduleName);
+    const bd = blockDirs.find((d) => d.name === sel.block.name)!;
+    await applyTemplate(bd.dir, moduleDir, vars);
+    commonModules.push(moduleName);
+  }
 
-      // 3. Clone blocks
-      console.log("[2/7] 拉取积木仓库...");
-      const blockDirs: { name: string; dir: string }[] = [];
+  // 5. Generate demo-common/pom.xml
+  console.log("[4/8] 生成 common 父 POM...");
+  await mkdir(commonDir, { recursive: true });
+  await writeFile(
+    resolve(commonDir, "pom.xml"),
+    buildCommonParentPom(projectName, groupId, javaVersion, commonModules),
+    "utf-8"
+  );
 
-      for (const sel of selected) {
-        const url = inferRepoUrl(sel.block.name, sel.block.repo);
-        console.log(`  clone ${url} (branch: ${sel.branch})...`);
-        const dir = await cloneBlock(url, sel.branch);
-        blockDirs.push({ name: sel.block.name, dir });
-      }
+  // 6. Generate demo-boot/
+  console.log("[5/8] 生成业务模块...");
+  const bootDir = resolve(targetDir, `${projectName}-boot`);
+  await generateBootModule(bootDir, projectName, groupId, basePackage, javaVersion, appStyle, commonModules);
 
-      // 4. Apply templates
-      console.log("[3/7] 生成项目源码...");
-      const targetDir = resolve(cwd, projectName);
-      const vars: Record<string, string> = {
-        basePackage,
-        groupId,
-        projectName,
-        javaVersion,
-      };
+  // 7. Generate AI rules
+  console.log("[6/8] 生成 AI 规则文件...");
+  await compileAiRules(blockDirs, targetDir, aiTool);
 
-      for (const bd of blockDirs) {
-        await applyTemplate(bd.dir, targetDir, vars);
-      }
+  // 8. Generate root pom.xml
+  console.log("[7/8] 生成根 pom.xml...");
+  await writeFile(
+    resolve(targetDir, "pom.xml"),
+    buildRootPom(projectName, groupId, javaVersion),
+    "utf-8"
+  );
 
-      // 5. Generate AI rules
-      console.log("[4/7] 生成 AI 规则文件...");
-      await compileAiRules(blockDirs, targetDir, aiTool);
+  // 9. Generate brick.json
+  console.log("[8/8] 生成 brick.json...");
+  const brickJson: BrickJson = {
+    projectName,
+    basePackage,
+    javaVersion,
+    aiTool,
+    style: appStyle,
+    blocks: selected.map((s) => ({
+      name: s.block.name,
+      variant: s.variantLabel,
+      version: s.block.version,
+    })),
+  };
+  await writeFile(
+    resolve(targetDir, "brick.json"),
+    JSON.stringify(brickJson, null, 2),
+    "utf-8"
+  );
 
-      // 6. Generate root pom.xml
-      console.log("[5/7] 生成根 pom.xml...");
-      if (style !== "simple") {
-        const rootPom = buildRootPom(
-          projectName,
-          groupId,
-          javaVersion,
-          selected,
-          style
-        );
-        await writeFile(resolve(targetDir, "pom.xml"), rootPom, "utf-8");
-      }
+  // Cleanup
+  for (const bd of blockDirs) {
+    await cleanupTemp(bd.dir);
+  }
 
-      // 7. Generate brick.json
-      console.log("[6/7] 生成 brick.json...");
-      const brickJson: BrickJson = {
-        projectName,
-        basePackage,
-        javaVersion,
-        aiTool,
-        style,
-        blocks: selected.map((s) => ({
-          name: s.block.name,
-          variant: s.variantLabel,
-          version: s.block.version,
-        })),
-      };
-      await writeFile(
-        resolve(targetDir, "brick.json"),
-        JSON.stringify(brickJson, null, 2),
-        "utf-8"
-      );
-
-      // 8. Cleanup temp dirs
-      console.log("[7/7] 清理临时文件...");
-      for (const bd of blockDirs) {
-        await cleanupTemp(bd.dir);
-      }
-
-      console.log(`\n项目已创建：${targetDir}`);
-      console.log("Done!");
+  console.log(`\n项目已创建：${targetDir}`);
+  console.log("Done!");
 }
 
 function resolveDeps(
@@ -237,7 +246,6 @@ function resolveDeps(
   const result = new Map(chosen.map((b) => [b.name, b]));
   const added: Block[] = [];
 
-  // Iteratively resolve dependencies
   let changed = true;
   while (changed) {
     changed = false;
@@ -262,60 +270,13 @@ function resolveDeps(
   return { all: [...result.values()], added };
 }
 
+// ── POM generators ──────────────────────────────────────────
+
 function buildRootPom(
   projectName: string,
   groupId: string,
-  javaVersion: string,
-  selected: SelectedBlock[],
-  style: string
+  javaVersion: string
 ): string {
-  const modules = selected
-    .map((s) => `        <module>${projectName}-common-${s.block.module}</module>`)
-    .join("\n");
-
-  if (style === "bom") {
-    return [
-      '<?xml version="1.0" encoding="UTF-8"?>',
-      '<project xmlns="http://maven.apache.org/POM/4.0.0"',
-      '         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"',
-      '         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">',
-      '    <modelVersion>4.0.0</modelVersion>',
-      "",
-      `    <groupId>${groupId}</groupId>`,
-      `    <artifactId>${projectName}</artifactId>`,
-      "    <version>0.0.0</version>",
-      "    <packaging>pom</packaging>",
-      "",
-      `    <name>${projectName}</name>`,
-      "",
-      "    <properties>",
-      `        <java.version>${javaVersion}</java.version>`,
-      `        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>`,
-      `        <brick.version>0.0.0</brick.version>`,
-      "    </properties>",
-      "",
-      "    <dependencyManagement>",
-      "        <dependencies>",
-      ...selected.map(
-        (s) =>
-          `            <dependency>\n` +
-          `                <groupId>${groupId}</groupId>\n` +
-          `                <artifactId>${projectName}-common-${s.block.module}</artifactId>\n` +
-          `                <version>${"$"}{brick.version}</version>\n` +
-          `            </dependency>`
-      ),
-      "        </dependencies>",
-      "    </dependencyManagement>",
-      "",
-      "    <modules>",
-      `        <module>${projectName}-common-bom</module>`,
-      modules,
-      "    </modules>",
-      "</project>",
-    ].join("\n");
-  }
-
-  // standard
   return [
     '<?xml version="1.0" encoding="UTF-8"?>',
     '<project xmlns="http://maven.apache.org/POM/4.0.0"',
@@ -332,12 +293,177 @@ function buildRootPom(
     "",
     "    <properties>",
     `        <java.version>${javaVersion}</java.version>`,
-    `        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>`,
+    '        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>',
     "    </properties>",
     "",
     "    <modules>",
-    modules,
+    `        <module>${projectName}-common</module>`,
+    `        <module>${projectName}-boot</module>`,
     "    </modules>",
     "</project>",
   ].join("\n");
 }
+
+function buildCommonParentPom(
+  projectName: string,
+  groupId: string,
+  javaVersion: string,
+  modules: string[]
+): string {
+  const moduleEntries = modules
+    .map((m) => `        <module>${m}</module>`)
+    .join("\n");
+
+  return [
+    '<?xml version="1.0" encoding="UTF-8"?>',
+    '<project xmlns="http://maven.apache.org/POM/4.0.0"',
+    '         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"',
+    '         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">',
+    '    <modelVersion>4.0.0</modelVersion>',
+    "",
+    "    <parent>",
+    "        <groupId>org.springframework.boot</groupId>",
+    "        <artifactId>spring-boot-starter-parent</artifactId>",
+    "        <version>3.4.0</version>",
+    "        <relativePath/>",
+    "    </parent>",
+    "",
+    `    <groupId>${groupId}</groupId>`,
+    `    <artifactId>${projectName}-common</artifactId>`,
+    "    <version>0.0.0</version>",
+    "    <packaging>pom</packaging>",
+    "",
+    "    <properties>",
+    `        <java.version>${javaVersion}</java.version>`,
+    "    </properties>",
+    "",
+    "    <modules>",
+    moduleEntries,
+    "    </modules>",
+    "</project>",
+  ].join("\n");
+}
+
+function buildBootPom(
+  projectName: string,
+  groupId: string,
+  javaVersion: string,
+  commonModules: string[]
+): string {
+  const deps = commonModules
+    .map(
+      (m) =>
+        "        <dependency>\n" +
+        `            <groupId>${groupId}</groupId>\n` +
+        `            <artifactId>${m}</artifactId>\n` +
+        "            <version>0.0.0</version>\n" +
+        "        </dependency>"
+    )
+    .join("\n");
+
+  return [
+    '<?xml version="1.0" encoding="UTF-8"?>',
+    '<project xmlns="http://maven.apache.org/POM/4.0.0"',
+    '         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"',
+    '         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">',
+    '    <modelVersion>4.0.0</modelVersion>',
+    "",
+    "    <parent>",
+    "        <groupId>org.springframework.boot</groupId>",
+    "        <artifactId>spring-boot-starter-parent</artifactId>",
+    "        <version>3.4.0</version>",
+    "        <relativePath/>",
+    "    </parent>",
+    "",
+    `    <groupId>${groupId}</groupId>`,
+    `    <artifactId>${projectName}-boot</artifactId>`,
+    "    <version>0.0.0</version>",
+    "    <packaging>jar</packaging>",
+    "",
+    "    <properties>",
+    `        <java.version>${javaVersion}</java.version>`,
+    "    </properties>",
+    "",
+    "    <dependencies>",
+    "        <dependency>",
+    "            <groupId>org.springframework.boot</groupId>",
+    "            <artifactId>spring-boot-starter-web</artifactId>",
+    "        </dependency>",
+    deps,
+    "    </dependencies>",
+    "",
+    "    <build>",
+    "        <plugins>",
+    "            <plugin>",
+    "                <groupId>org.springframework.boot</groupId>",
+    "                <artifactId>spring-boot-maven-plugin</artifactId>",
+    "            </plugin>",
+    "        </plugins>",
+    "    </build>",
+    "</project>",
+  ].join("\n");
+}
+
+// ── Business module generator ────────────────────────────────
+
+async function generateBootModule(
+  bootDir: string,
+  projectName: string,
+  groupId: string,
+  basePackage: string,
+  javaVersion: string,
+  appStyle: string,
+  commonModules: string[]
+): Promise<void> {
+  const pkgPath = basePackage.replace(/\./g, "/");
+  const srcDir = resolve(bootDir, "src", "main", "java", pkgPath);
+
+  await mkdir(srcDir, { recursive: true });
+
+  // Generate style-specific packages (placeholder .gitkeep)
+  const styleDirs: string[] = [];
+  switch (appStyle) {
+    case "mvc":
+      styleDirs.push("controller", "service", "mapper");
+      break;
+    case "ddd":
+      styleDirs.push("interfaces", "application", "domain", "infrastructure");
+      break;
+    case "biz-api":
+      styleDirs.push("api", "biz");
+      break;
+    // simple: no extra dirs
+  }
+
+  for (const d of styleDirs) {
+    await mkdir(resolve(srcDir, d), { recursive: true });
+  }
+
+  // Generate Application.java
+  const appName = projectName.charAt(0).toUpperCase() + projectName.slice(1) + "Application";
+  await writeFile(
+    resolve(srcDir, `${appName}.java`),
+    [
+      `package ${basePackage};`,
+      "",
+      "import org.springframework.boot.SpringApplication;",
+      "import org.springframework.boot.autoconfigure.SpringBootApplication;",
+      "",
+      "@SpringBootApplication",
+      `public class ${appName} {`,
+      "",
+      `    public static void main(String[] args) {`,
+      `        SpringApplication.run(${appName}.class, args);`,
+      "    }",
+      "}",
+    ].join("\n"),
+    "utf-8"
+  );
+
+  // Generate pom.xml
+  await writeFile(
+    resolve(bootDir, "pom.xml"),
+    buildBootPom(projectName, groupId, javaVersion, commonModules),
+    "utf-8"
+  );
+}
diff --git a/src/lib/template.ts b/src/lib/template.ts
index e822881..b1190ef 100644
--- a/src/lib/template.ts
+++ b/src/lib/template.ts
@@ -1,4 +1,4 @@
-import { cp, readFile, writeFile, rename, readdir, mkdir } from "node:fs/promises";
+import { cp, readFile, writeFile, readdir, mkdir, rm } from "node:fs/promises";
 import { join, dirname } from "node:path";
 import { existsSync } from "node:fs";
 
@@ -82,8 +82,15 @@ async function renamePlaceholders(
 
     if (newName !== oldName) {
       const dest = join(parent, newName);
-      await mkdir(dirname(dest), { recursive: true });
-      await rename(path, dest);
+      await mkdir(dest, { recursive: true });
+      // Copy children to new location, then remove old dir
+      const children = await readdir(path, { withFileTypes: true });
+      for (const child of children) {
+        const srcChild = join(path, child.name);
+        const dstChild = join(dest, child.name);
+        await cp(srcChild, dstChild, { recursive: true });
+      }
+      await rm(path, { recursive: true, force: true });
     }
   }
 }