diff --git a/AGENTS.md b/AGENTS.md
index 8c43dba..58ef04e 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -9,6 +9,8 @@
 3. 同步更新 `CHANGELOG.md` 的 `Unreleased` 段（按 新增 / 修复 / 变更 分类）
 4. 推送分支 → 开 PR → 等 `ci.yml` 绿 → rebase 合并并删除分支；**不直接推 main**
 
+> main 已启用分支保护（GitHub 设置）：必须走 PR、`build-test` 必须通过且分支最新、禁 force push/删除、强制线性历史——直推 main 会被 GitHub 拒绝，规则在 Settings → Branches 可调。
+
 ## 提交前必须通过
 
 ```bash
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 97968ca..b898ceb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,9 @@
 
 ### 新增
 - 帧定界基准测试 `bench/StreamFrame.Benchmarks`（BenchmarkDotNet）：LengthPrefix/StxEtx 的流式 vs 纯函数编码对比与切帧吞吐，为"流式零拷贝"说法提供可复现数据。
+- 项目 LOGO（`docs/logo/`，SVG 母版 + PNG），README 双语版接入展示、两个 NuGet 包启用包图标（随下个版本发布生效）。
+- README 新增 CI 构建状态徽章；main 分支保护（必须走 PR 且 CI 通过、禁 force push/删除、强制线性历史）。
+- 英文版 README（`README.en.md`，与中文版互链），便于国际用户检索与阅读。
 
 ### 修复
 - 暂无
diff --git a/README.en.md b/README.en.md
index 67c8a95..542a9e8 100644
--- a/README.en.md
+++ b/README.en.md
@@ -1,5 +1,10 @@
+<p align="center">
+  <img src="https://raw.githubusercontent.com/CSJ608/StreamFrame/main/docs/logo/icon-512.png" width="120" alt="StreamFrame logo" />
+</p>
+
 # StreamFrame
 
+[![CI](https://github.com/CSJ608/StreamFrame/actions/workflows/ci.yml/badge.svg)](https://github.com/CSJ608/StreamFrame/actions/workflows/ci.yml)
 [![NuGet](https://img.shields.io/nuget/v/StreamFrame.svg)](https://www.nuget.org/packages/StreamFrame)
 [![NuGet Downloads](https://img.shields.io/nuget/dt/StreamFrame)](https://www.nuget.org/stats/packages/StreamFrame?groupby=Version)
 
diff --git a/README.md b/README.md
index 63d29fa..7926a94 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,10 @@
+<p align="center">
+  <img src="https://raw.githubusercontent.com/CSJ608/StreamFrame/main/docs/logo/icon-512.png" width="120" alt="StreamFrame logo" />
+</p>
+
 # StreamFrame
 
+[![CI](https://github.com/CSJ608/StreamFrame/actions/workflows/ci.yml/badge.svg)](https://github.com/CSJ608/StreamFrame/actions/workflows/ci.yml)
 [![NuGet](https://img.shields.io/nuget/v/StreamFrame.svg)](https://www.nuget.org/packages/StreamFrame)
 [![NuGet Downloads](https://img.shields.io/nuget/dt/StreamFrame)](https://www.nuget.org/stats/packages/StreamFrame?groupby=Version)
 
diff --git a/docs/logo/icon-512.png b/docs/logo/icon-512.png
new file mode 100644
index 0000000..21eb90d
Binary files /dev/null and b/docs/logo/icon-512.png differ
diff --git a/docs/logo/icon.png b/docs/logo/icon.png
new file mode 100644
index 0000000..b9f07ad
Binary files /dev/null and b/docs/logo/icon.png differ
diff --git a/docs/logo/streamframe.svg b/docs/logo/streamframe.svg
new file mode 100644
index 0000000..0b67040
--- /dev/null
+++ b/docs/logo/streamframe.svg
@@ -0,0 +1,13 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 128 128">
+  <!-- StreamFrame logo: two length-prefixed frames riding a byte stream -->
+  <rect width="128" height="128" rx="28" fill="#4338CA"/>
+  <!-- stream: one full period, two quadratic segments -->
+  <path d="M 18 90 Q 41 72 64 90 Q 87 108 110 90"
+        fill="none" stroke="#22D3EE" stroke-width="9" stroke-linecap="round"/>
+  <!-- frame A (upper-left): white outline + inset cyan header cell -->
+  <rect x="22" y="28" width="42" height="32" rx="7" fill="none" stroke="#FFFFFF" stroke-width="5"/>
+  <rect x="25" y="31" width="13" height="26" rx="3" fill="#22D3EE"/>
+  <!-- frame B (stepped lower-right, smaller) -->
+  <rect x="72" y="38" width="36" height="28" rx="7" fill="none" stroke="#FFFFFF" stroke-width="5"/>
+  <rect x="75" y="41" width="12" height="22" rx="3" fill="#22D3EE"/>
+</svg>
diff --git a/src/StreamFrame.Protocols.Xml/StreamFrame.Protocols.Xml.csproj b/src/StreamFrame.Protocols.Xml/StreamFrame.Protocols.Xml.csproj
index ae32c56..b10b3c2 100644
--- a/src/StreamFrame.Protocols.Xml/StreamFrame.Protocols.Xml.csproj
+++ b/src/StreamFrame.Protocols.Xml/StreamFrame.Protocols.Xml.csproj
@@ -6,6 +6,7 @@
 
   <ItemGroup>
     <None Include="..\..\README.md" Pack="true" PackagePath="\" />
+    <None Include="..\..\docs\logo\icon.png" Pack="true" PackagePath="\" />
   </ItemGroup>
 
   <ItemGroup>
@@ -28,6 +29,7 @@
     <Description>StreamFrame 的 XML 报文示例驱动：XmlDocumentCodec（XmlSerializer / XmlWriter 编解码）。</Description>
     <Authors>Marci</Authors>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
+    <PackageIcon>icon.png</PackageIcon>
     <PackageReadmeFile>README.md</PackageReadmeFile>
     <RepositoryType>git</RepositoryType>
     <RepositoryUrl>https://github.com/CSJ608/StreamFrame</RepositoryUrl>
diff --git a/src/StreamFrame/StreamFrame.csproj b/src/StreamFrame/StreamFrame.csproj
index 6834855..6129063 100644
--- a/src/StreamFrame/StreamFrame.csproj
+++ b/src/StreamFrame/StreamFrame.csproj
@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <TargetFramework>net8.0</TargetFramework>
@@ -13,6 +13,7 @@
     <Description>通用 socket 通讯框架：帧定界（IFramer）与帧内编解码（ICodec&lt;TMessage&gt;）插件化，支持长度前缀 / STX-ETX 定界与 IPv4/IPv6 双栈，可选流式零拷贝发送。</Description>
     <Authors>Marci</Authors>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
+    <PackageIcon>icon.png</PackageIcon>
     <PackageReadmeFile>README.md</PackageReadmeFile>
     <RepositoryType>git</RepositoryType>
     <RepositoryUrl>https://github.com/CSJ608/StreamFrame</RepositoryUrl>
@@ -35,6 +36,7 @@
 
   <ItemGroup>
     <None Include="..\..\README.md" Pack="true" PackagePath="\" />
+    <None Include="..\..\docs\logo\icon.png" Pack="true" PackagePath="\" />
   </ItemGroup>
 
 </Project>