diff --git a/README.md b/README.md
index 08b54b1..63372f6 100644
--- a/README.md
+++ b/README.md
@@ -69,8 +69,8 @@ Markdown 中仍使用普通图片语法，构建工具会自动输出 WebP
     每个链接指向页面的 Markdown 版本。
 - 每页 Markdown 版本：`nmteam build` 时在每个页面旁生成同路径的 `.md` 文件
     （如 `/nmbot-telegram/mcp.md`）。
-- 页面顶部的文章操作区：**复制本文 Markdown** 直接复制当前页面原文；
-    **使用［品牌图标］打开本文** 菜单提供 GitHub 源文件、Markdown 版本，
+- 页面顶部的文章操作区（首页不显示）：**复制 Markdown** 直接复制当前页面
+    原文；**使用［品牌图标］打开** 菜单提供 GitHub 源文件、Markdown 版本，
     以及 Perplexity、Grok、ChatGPT、Claude Web、Claude Desktop、
     Claude Code、OpenAI Codex、Cursor 八种 AI 打开方式。
 
@@ -83,9 +83,16 @@ Markdown 中仍使用普通图片语法，构建工具会自动输出 WebP
 ```bash
 uv run nmteam generate # 仅重新生成文档结构
 uv run nmteam clean    # 清理 cache/、generated/ 和 site/
+uv run nmteam serve    # 预览 site/（.md 以 text/plain; charset=utf-8 提供）
 uv run nmteam --help   # 显示完整命令帮助
 ```
 
+`nmteam serve` 默认监听 `127.0.0.1:8124`，可用 `--port` / `--bind`
+调整。与裸 `python -m http.server` 不同，它把 `.md` 文件的
+`Content-Type` 显式设为 `text/plain; charset=utf-8`（Python 3.13+ 的
+`mimetypes` 会把 `.md` 判为 `text/markdown`，部分客户端会下载而非内联
+显示），保证每页 Markdown 版本在任何浏览器中都能直接阅读。
+
 ## 平台启动器
 
 直接运行 `uv run nmteam` 是推荐方式。`scripts/` 也提供不包含业务逻辑的薄启动器；它们会自动定位仓库根目录并原样传递参数。
diff --git a/src/nmteam_support/cli.py b/src/nmteam_support/cli.py
index 37d0e1f..e832c12 100644
--- a/src/nmteam_support/cli.py
+++ b/src/nmteam_support/cli.py
@@ -21,6 +21,7 @@
     read_redirects,
     write_redirects,
 )
+from nmteam_support.serve import DEFAULT_BIND, DEFAULT_PORT, serve_site
 
 app = typer.Typer(invoke_without_command=True)
 redirects_app = typer.Typer(no_args_is_help=True)
@@ -182,6 +183,19 @@ def install_command() -> None:
     _exit_on_error(cmd_install())
 
 
+@app.command("serve")
+def serve_command(
+    port: int = typer.Option(DEFAULT_PORT, "--port", "-p", help="TCP port to listen on."),
+    bind: str = typer.Option(DEFAULT_BIND, "--bind", "-b", help="Address to bind to."),
+) -> None:
+    """Serve the built site; Markdown is served as text/plain (UTF-8)."""
+    site_dir = default_options().mkdocs_yml_path.parent / "site"
+    if not site_dir.is_dir():
+        typer.echo("site/ 不存在，请先运行 `nmteam build`。", err=True)
+        raise typer.Exit(code=1)
+    serve_site(site_dir, port, bind)
+
+
 @app.command("check")
 def check_command() -> None:
     """Run linting, tests, formatting checks, and a strict build."""
diff --git a/src/nmteam_support/serve.py b/src/nmteam_support/serve.py
new file mode 100644
index 0000000..bfd9ac0
--- /dev/null
+++ b/src/nmteam_support/serve.py
@@ -0,0 +1,49 @@
+"""Static file server that serves Markdown as ``text/plain; charset=utf-8``.
+
+Standard-library only, so ``nmteam serve`` works on every platform without
+extra dependencies. The MIME override matters because Python's ``mimetypes``
+module maps ``.md`` to ``text/markdown`` on 3.13+, which some browsers and
+clients download or render inconsistently; ``text/plain`` with an explicit
+UTF-8 charset is the most interoperable way to expose the per-page Markdown
+copies staged into ``site/``.
+"""
+
+from __future__ import annotations
+
+from functools import partial
+from http.server import SimpleHTTPRequestHandler, ThreadingHTTPServer
+from pathlib import Path
+from typing import ClassVar
+
+DEFAULT_PORT = 8124
+DEFAULT_BIND = "127.0.0.1"
+
+
+class MarkdownPlainHandler(SimpleHTTPRequestHandler):
+    """Serve ``.md``/``.markdown`` files as plain UTF-8 text."""
+
+    extensions_map: ClassVar[dict[str, str]] = {
+        **SimpleHTTPRequestHandler.extensions_map,
+        ".md": "text/plain; charset=utf-8",
+        ".markdown": "text/plain; charset=utf-8",
+    }
+
+
+def create_server(
+    directory: Path, port: int = DEFAULT_PORT, bind: str = DEFAULT_BIND
+) -> ThreadingHTTPServer:
+    """Build a threaded HTTP server rooted at ``directory``."""
+    resolved = directory.resolve()
+    handler = partial(MarkdownPlainHandler, directory=str(resolved))
+    return ThreadingHTTPServer((bind, port), handler)
+
+
+def serve_site(directory: Path, port: int = DEFAULT_PORT, bind: str = DEFAULT_BIND) -> None:
+    """Serve ``directory`` statically until interrupted."""
+    server = create_server(directory, port, bind)
+    host, bound_port = server.server_address
+    print(f"Serving {directory.resolve()} at http://{host}:{bound_port}")
+    try:
+        server.serve_forever()
+    finally:
+        server.server_close()
diff --git a/tests/test_cli.py b/tests/test_cli.py
index a65d4b6..7a88993 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -83,6 +83,33 @@ def test_redirects_list_displays_existing_rules(tmp_path, monkeypatch):
     assert "/old/ -> /new/" in result.stdout
 
 
+def test_serve_command_serves_site_with_defaults(tmp_path, monkeypatch):
+    monkeypatch.chdir(tmp_path)
+    (tmp_path / "site").mkdir()
+    captured = {}
+    monkeypatch.setattr(
+        cli,
+        "serve_site",
+        lambda directory, port, bind: captured.update(directory=directory, port=port, bind=bind),
+    )
+
+    result = runner.invoke(cli.app, ["serve"])
+
+    assert result.exit_code == 0
+    assert captured["directory"] == tmp_path / "site"
+    assert captured["port"] == 8124
+    assert captured["bind"] == "127.0.0.1"
+
+
+def test_serve_command_rejects_missing_site(tmp_path, monkeypatch):
+    monkeypatch.chdir(tmp_path)
+
+    result = runner.invoke(cli.app, ["serve"])
+
+    assert result.exit_code != 0
+    assert "site/ 不存在" in result.stderr
+
+
 def test_redirects_remove_deletes_existing_rule(tmp_path, monkeypatch):
     monkeypatch.chdir(tmp_path)
     (tmp_path / "redirects.json").write_text(
diff --git a/tests/test_serve.py b/tests/test_serve.py
new file mode 100644
index 0000000..d322952
--- /dev/null
+++ b/tests/test_serve.py
@@ -0,0 +1,51 @@
+"""Static serve tests: Markdown is served as text/plain with UTF-8 charset."""
+
+import threading
+import urllib.request
+from unittest.mock import Mock
+
+import pytest
+
+import nmteam_support.serve as serve
+
+
+def _base_url(server) -> str:
+    host, port = server.server_address
+    return f"http://{host}:{port}"
+
+
+def test_markdown_served_as_text_plain_utf8(tmp_path):
+    (tmp_path / "page.md").write_text("# 标题\n", encoding="utf-8", newline="\n")
+    (tmp_path / "index.html").write_text("<h1>hi</h1>", encoding="utf-8")
+
+    server = serve.create_server(tmp_path, port=0)
+    thread = threading.Thread(target=server.serve_forever, daemon=True)
+    thread.start()
+    try:
+        base = _base_url(server)
+        with urllib.request.urlopen(f"{base}/page.md", timeout=5) as response:
+            assert response.headers.get_content_type() == "text/plain"
+            assert response.headers.get_content_charset() == "utf-8"
+            assert response.read().decode("utf-8") == "# 标题\n"
+        with urllib.request.urlopen(f"{base}/index.html", timeout=5) as response:
+            assert response.headers.get_content_type() == "text/html"
+    finally:
+        server.shutdown()
+        server.server_close()
+
+
+def test_markdown_extension_map_excludes_text_markdown():
+    for ext in (".md", ".markdown"):
+        assert serve.MarkdownPlainHandler.extensions_map[ext] == ("text/plain; charset=utf-8")
+    assert "text/markdown" not in serve.MarkdownPlainHandler.extensions_map.values()
+
+
+def test_serve_site_closes_server_and_propagates_interrupt(tmp_path, monkeypatch):
+    server = Mock(server_address=("127.0.0.1", 8124))
+    server.serve_forever.side_effect = KeyboardInterrupt
+    monkeypatch.setattr(serve, "create_server", lambda *_args: server)
+
+    with pytest.raises(KeyboardInterrupt):
+        serve.serve_site(tmp_path)
+
+    server.server_close.assert_called_once_with()