diff --git a/11_compose/11.7_rails.md b/11_compose/11.7_rails.md
index 4f5072e..35ada66 100644
--- a/11_compose/11.7_rails.md
+++ b/11_compose/11.7_rails.md
@@ -106,6 +106,11 @@ services:
       POSTGRES_PASSWORD: password
     volumes:
       - postgres_data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U postgres"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
 
   web:
     build: .
@@ -115,7 +120,8 @@ services:
     ports:
       - "3000:3000"
     depends_on:
-      - db
+      db:
+        condition: service_healthy
     environment:
       DATABASE_URL: postgres://postgres:password@db:5432/myapp_development
 
@@ -128,7 +134,7 @@ volumes:
 |--------|------|
 | `rm -f tmp/pids/server.pid` | 清理上次异常退出留下的 PID 文件 |
 | `volumes: .:/myapp` | 挂载代码目录，支持热更新 |
-| `depends_on: db` | 确保数据库先启动 |
+| `depends_on` + `condition` | 等待数据库健康检查通过后再启动 |
 | `DATABASE_URL` | Rails 12-factor 风格的数据库配置 |
 
 ### 11.7.6 步骤 4：生成 Rails 项目