diff --git a/LanMountainDesktop.PluginIsolation.Ipc/InProcPluginIpcTransport.cs b/LanMountainDesktop.PluginIsolation.Ipc/InProcPluginIpcTransport.cs
new file mode 100644
index 0000000..a5a414d
--- /dev/null
+++ b/LanMountainDesktop.PluginIsolation.Ipc/InProcPluginIpcTransport.cs
@@ -0,0 +1,74 @@
+namespace LanMountainDesktop.PluginIsolation.Ipc;
+
+/// <summary>
+/// 进程内 IPC 传输。将 <see cref="PluginIpcClient"/> 的调度委托直接绑定到
+/// <see cref="PluginIpcServer"/> 的处理入口，不经过命名管道。
+/// 用于不支持子进程/命名管道的平台（如 Android），插件契约与序列化路径保持不变：
+/// 请求仍会经过 JsonElement 序列化/反序列化边界，与管道传输行为一致。
+/// </summary>
+public sealed class InProcPluginIpcTransport : IDisposable
+{
+    private readonly PluginIpcClient _client;
+    private volatile bool _disposed;
+
+    private InProcPluginIpcTransport(PluginIpcClient client, PluginIpcServer server)
+    {
+        _client = client;
+        Server = server;
+
+        client.RequestDispatcher = (route, payload, cancellationToken) =>
+        {
+            ThrowIfDisposed();
+            return server.HandleRequestAsync(route, payload, cancellationToken);
+        };
+
+        client.NotificationDispatcher = (route, payload, cancellationToken) =>
+        {
+            ThrowIfDisposed();
+            return server.HandleNotificationAsync(route, payload, cancellationToken);
+        };
+    }
+
+    /// <summary>
+    /// 绑定后的服务端。
+    /// </summary>
+    public PluginIpcServer Server { get; }
+
+    /// <summary>
+    /// 绑定后的客户端。请求/通知将直接分发到 <see cref="Server"/>。
+    /// </summary>
+    public PluginIpcClient Client => _client;
+
+    /// <summary>
+    /// 将客户端与服务端以进程内直通方式连接。
+    /// </summary>
+    /// <param name="client">插件侧客户端</param>
+    /// <param name="server">宿主侧服务端</param>
+    /// <returns>传输句柄；Dispose 后客户端调度将抛出 <see cref="ObjectDisposedException"/>。</returns>
+    public static InProcPluginIpcTransport Connect(PluginIpcClient client, PluginIpcServer server)
+    {
+        ArgumentNullException.ThrowIfNull(client);
+        ArgumentNullException.ThrowIfNull(server);
+        return new InProcPluginIpcTransport(client, server);
+    }
+
+    /// <summary>
+    /// 断开传输。之后客户端的请求/通知将失败。
+    /// </summary>
+    public void Dispose()
+    {
+        if (_disposed)
+        {
+            return;
+        }
+
+        _disposed = true;
+        _client.RequestDispatcher = null;
+        _client.NotificationDispatcher = null;
+    }
+
+    private void ThrowIfDisposed()
+    {
+        ObjectDisposedException.ThrowIf(_disposed, this);
+    }
+}
diff --git a/LanMountainDesktop.Tests/InProcPluginIpcTransportTests.cs b/LanMountainDesktop.Tests/InProcPluginIpcTransportTests.cs
new file mode 100644
index 0000000..70bb325
--- /dev/null
+++ b/LanMountainDesktop.Tests/InProcPluginIpcTransportTests.cs
@@ -0,0 +1,108 @@
+using System.Text.Json;
+using LanMountainDesktop.PluginIsolation.Ipc;
+using Xunit;
+
+namespace LanMountainDesktop.Tests;
+
+/// <summary>
+/// 进程内 IPC 传输测试：验证与管道传输相同的契约语义
+/// （请求/响应往返、通知投递、错误传播、释放语义）。
+/// </summary>
+public sealed class InProcPluginIpcTransportTests
+{
+    private static (PluginIpcClient Client, PluginIpcServer Server) CreatePair()
+    {
+        var server = new PluginIpcServer(new PluginIpcServerOptions
+        {
+            PipeName = "inproc-test"
+        });
+        var client = new PluginIpcClient(new PluginIpcClientOptions
+        {
+            PipeName = "inproc-test"
+        });
+        return (client, server);
+    }
+
+    [Fact]
+    public async Task RequestAsync_RoundTripsThroughServerHandler()
+    {
+        var (client, server) = CreatePair();
+        server.MapRequest<string, string>("test/echo", (payload, _) => Task.FromResult($"echo:{payload}"));
+        using var transport = InProcPluginIpcTransport.Connect(client, server);
+
+        var response = await client.RequestAsync<string, string>("test/echo", "hello");
+
+        Assert.Equal("echo:hello", response);
+    }
+
+    [Fact]
+    public async Task NotifyAsync_DeliversPayloadToServerHandler()
+    {
+        var (client, server) = CreatePair();
+        var received = new TaskCompletionSource<string?>();
+        server.MapNotification<string>("test/notify", (payload, _) =>
+        {
+            received.TrySetResult(payload);
+            return Task.CompletedTask;
+        });
+        using var transport = InProcPluginIpcTransport.Connect(client, server);
+
+        await client.NotifyAsync("test/notify", "ping");
+
+        var payload = await received.Task.WaitAsync(TimeSpan.FromSeconds(5));
+        Assert.Equal("ping", payload);
+    }
+
+    [Fact]
+    public async Task RequestAsync_WhenHandlerThrows_PropagatesException()
+    {
+        var (client, server) = CreatePair();
+        server.MapRequest<string, string>("test/fail", (_, _) => throw new InvalidOperationException("handler failed"));
+        using var transport = InProcPluginIpcTransport.Connect(client, server);
+
+        var ex = await Assert.ThrowsAsync<InvalidOperationException>(
+            () => client.RequestAsync<string, string>("test/fail", "x"));
+        Assert.Equal("handler failed", ex.Message);
+    }
+
+    [Fact]
+    public async Task RequestAsync_WhenRouteNotRegistered_Throws()
+    {
+        var (client, server) = CreatePair();
+        using var transport = InProcPluginIpcTransport.Connect(client, server);
+
+        await Assert.ThrowsAsync<InvalidOperationException>(
+            () => client.RequestAsync<string, string>("test/missing", "x"));
+    }
+
+    [Fact]
+    public async Task RequestAsync_AfterDispose_ThrowsObjectDisposed()
+    {
+        var (client, server) = CreatePair();
+        server.MapRequest<string, string>("test/echo", (payload, _) => Task.FromResult(payload));
+        var transport = InProcPluginIpcTransport.Connect(client, server);
+        transport.Dispose();
+
+        // Dispose 后调度委托被摘除，客户端回落到未绑定状态。
+        await Assert.ThrowsAsync<NotSupportedException>(
+            () => client.RequestAsync<string, string>("test/echo", "x"));
+    }
+
+    [Fact]
+    public async Task RequestAsync_WithCancellation_PassesTokenToHandler()
+    {
+        var (client, server) = CreatePair();
+        using var cts = new CancellationTokenSource();
+        server.MapRequest<string, string>("test/cancel", async (_, ct) =>
+        {
+            await Task.Delay(Timeout.Infinite, ct);
+            return "never";
+        });
+        using var transport = InProcPluginIpcTransport.Connect(client, server);
+
+        var task = client.RequestAsync<string, string>("test/cancel", "x", cts.Token);
+        cts.Cancel();
+
+        await Assert.ThrowsAnyAsync<OperationCanceledException>(() => task);
+    }
+}
diff --git a/LanMountainDesktop.Tests/LanMountainDesktop.Tests.csproj b/LanMountainDesktop.Tests/LanMountainDesktop.Tests.csproj
index 763edb9..f59fcc1 100644
--- a/LanMountainDesktop.Tests/LanMountainDesktop.Tests.csproj
+++ b/LanMountainDesktop.Tests/LanMountainDesktop.Tests.csproj
@@ -19,6 +19,7 @@
 
   <ItemGroup>
     <ProjectReference Include="..\LanMountainDesktop\LanMountainDesktop.csproj" />
+    <ProjectReference Include="..\LanMountainDesktop.PluginIsolation.Ipc\LanMountainDesktop.PluginIsolation.Ipc.csproj" />
     <ProjectReference Include="..\LanMountainDesktop.AirAppRuntime\LanMountainDesktop.AirAppRuntime.csproj" />
     <ProjectReference Include="..\LanMountainDesktop.Launcher\LanMountainDesktop.Launcher.csproj" />
     <ProjectReference Include="..\LanDesktopPLONDS.installer\LanDesktopPLONDS.installer.csproj" />