diff --git a/day01/devcontainer/.devcontainer/devcontainer.json b/day01/devcontainer/.devcontainer/devcontainer.json
new file mode 100644
index 0000000..5355bf6
--- /dev/null
+++ b/day01/devcontainer/.devcontainer/devcontainer.json
@@ -0,0 +1,29 @@
+{
+  "name": "Go Dev Container (demo)",
+  "image": "mcr.microsoft.com/devcontainers/base:ubuntu",
+  "features": {
+    "ghcr.io/devcontainers/features/common-utils:2": {},
+    "ghcr.io/devcontainers/features/go:1": {
+      "version": "1.25"
+    }
+  },
+  "remoteUser": "vscode",
+  "workspaceFolder": "/workspaces/${localWorkspaceFolderBasename}",
+  "postCreateCommand": "cd demo && go mod download && go install github.com/go-delve/delve/cmd/dlv@latest",
+  "customizations": {
+    "vscode": {
+      "extensions": ["golang.go"],
+      "settings": {
+        "go.useLanguageServer": true,
+        "go.toolsManagement.autoUpdate": true,
+        "go.gopath": "/go",
+        "go.testFlags": ["-v"],
+        "go.lintTool": "golangci-lint",
+        "go.lintFlags": ["--fast"],
+        "[go]": {
+          "editor.formatOnSave": true
+        }
+      }
+    }
+  }
+}
diff --git a/day01/devcontainer/.vscode/launch.json b/day01/devcontainer/.vscode/launch.json
new file mode 100644
index 0000000..aeb72c6
--- /dev/null
+++ b/day01/devcontainer/.vscode/launch.json
@@ -0,0 +1,24 @@
+{
+  "$schema": "https://json.schemastore.org/launch.json",
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "name": "Debug demo/main.go",
+      "type": "go",
+      "request": "launch",
+      "mode": "auto",
+      "program": "${workspaceFolder}/demo",
+      "cwd": "${workspaceFolder}/demo",
+      "console": "integratedTerminal"
+    },
+    {
+      "name": "Debug demo tests",
+      "type": "go",
+      "request": "launch",
+      "mode": "test",
+      "program": "${workspaceFolder}/demo",
+      "cwd": "${workspaceFolder}/demo",
+      "console": "integratedTerminal"
+    }
+  ]
+}
diff --git a/day01/devcontainer/README.md b/day01/devcontainer/README.md
new file mode 100644
index 0000000..7db051b
--- /dev/null
+++ b/day01/devcontainer/README.md
@@ -0,0 +1,31 @@
+## 使用 Dev Container 开发 demo 工程
+
+此目录下的 `demo/` 是一个 Go 工程。已提供 VS Code Dev Container 配置，支持在容器内进行开发与调试。
+
+### 快速开始
+- 前置：本地安装 VS Code 与 Dev Containers 扩展（Microsoft 提供）。
+- 打开文件夹：在 VS Code 中打开 `day01/devcontainer` 目录。
+- 重新在容器中打开：命令面板运行 “Dev Containers: Reopen in Container”。
+- 首次启动会执行依赖下载：`postCreateCommand` 会在 `demo/` 下执行 `go mod download`。
+- 镜像说明：使用 `mcr.microsoft.com/devcontainers/base:ubuntu`，通过 Dev Containers Feature 安装 Go（版本 1.25）。
+
+### 容器内开发
+- 代码位置：`/workspaces/<当前打开的文件夹>/demo`。
+- 常用操作：
+	- 运行：在容器终端进入 `demo/` 目录后执行 `go run main.go`
+	- 构建：`go build`
+	- 测试：`go test ./...`
+- 已安装：Go 工具链与 VS Code Go 扩展；保存时自动格式化与常用 lint 设置。
+
+### 调试
+- 已自动安装 Delve（`dlv`）。
+- VS Code 已提供调试配置：[day01/devcontainer/.vscode/launch.json](day01/devcontainer/.vscode/launch.json)
+	- 直接在 “Run and Debug” 视图选择 “Debug demo/main.go” 或 “Debug demo tests”。
+	- 断点与变量查看可在容器内正常使用。
+
+### 备注
+- 如需额外工具（如 `golangci-lint` 的安装或 `dlv` 调试器），可在 `.devcontainer/devcontainer.json` 中增加特性或 `postCreateCommand`。
+
+# devcontainer demo 工程
+
+针对简单场景: 直接用 git bash 做完 vscode的命令工具 来使用
\ No newline at end of file
diff --git a/day01/devcontainer/demo/go.mod b/day01/devcontainer/demo/go.mod
new file mode 100644
index 0000000..41e99c4
--- /dev/null
+++ b/day01/devcontainer/demo/go.mod
@@ -0,0 +1,3 @@
+module demo
+
+go 1.25.5
diff --git a/day01/devcontainer/demo/main.go b/day01/devcontainer/demo/main.go
new file mode 100644
index 0000000..16e2b22
--- /dev/null
+++ b/day01/devcontainer/demo/main.go
@@ -0,0 +1,5 @@
+package main
+
+func main() {
+	println("Hello, World!")
+}