diff --git a/GFramework.Core.Tests/coroutine/CoroutineComposeExtensionsTests.cs b/GFramework.Core.Tests/coroutine/CoroutineComposeExtensionsTests.cs
new file mode 100644
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--- /dev/null
+++ b/GFramework.Core.Tests/coroutine/CoroutineComposeExtensionsTests.cs
@@ -0,0 +1,349 @@
+using GFramework.Core.Abstractions.coroutine;
+using GFramework.Core.coroutine.extensions;
+using GFramework.Core.coroutine.instructions;
+using NUnit.Framework;
+
+namespace GFramework.Core.Tests.coroutine;
+
+/// <summary>
+///     CoroutineComposeExtensions的单元测试类
+///     测试内容包括：
+///     - Then(Action) 方法：协程完成后执行动作
+///     - Then(IEnumerator) 方法：两个协程顺序组合
+/// </summary>
+[TestFixture]
+public class CoroutineComposeExtensionsTests
+{
+    /// <summary>
+    ///     创建一个简单的测试协程，执行指定次数并记录执行
+    /// </summary>
+    private static IEnumerator<IYieldInstruction> CreateTestCoroutine(int steps, Action? onStep = null)
+    {
+        for (var i = 0; i < steps; i++)
+        {
+            onStep?.Invoke();
+            yield return new WaitOneFrame();
+        }
+    }
+
+    /// <summary>
+    ///     验证Then(Action)应该返回有效的协程
+    /// </summary>
+    [Test]
+    public void Then_Action_Should_Return_Valid_Coroutine()
+    {
+        var first = CreateTestCoroutine(1);
+        var combined = first.Then(() => { });
+
+        Assert.That(combined, Is.InstanceOf<IEnumerator<IYieldInstruction>>());
+    }
+
+    /// <summary>
+    ///     验证Then(Action)应该先执行协程再执行动作
+    /// </summary>
+    [Test]
+    public void Then_Action_Should_Execute_Coroutine_Then_Action()
+    {
+        var executionOrder = new List<string>();
+
+        var first = CreateTestCoroutine(2, () => executionOrder.Add("coroutine"));
+        var combined = first.Then(() => executionOrder.Add("action"));
+
+        // 执行组合协程
+        while (combined.MoveNext())
+        {
+            combined.Current.Update(0.016);
+        }
+
+        Assert.That(executionOrder.Count, Is.EqualTo(3));
+        Assert.That(executionOrder[0], Is.EqualTo("coroutine"));
+        Assert.That(executionOrder[1], Is.EqualTo("coroutine"));
+        Assert.That(executionOrder[2], Is.EqualTo("action"));
+    }
+
+    /// <summary>
+    ///     验证Then(Action)应该在空协程后立即执行动作
+    /// </summary>
+    [Test]
+    public void Then_Action_Should_Execute_Action_After_Empty_Coroutine()
+    {
+        var actionExecuted = false;
+
+        var first = CreateTestCoroutine(0);
+        var combined = first.Then(() => actionExecuted = true);
+
+        // 空协程应该立即完成并执行动作
+        var hasMore = combined.MoveNext();
+
+        Assert.That(hasMore, Is.False);
+        Assert.That(actionExecuted, Is.True);
+    }
+
+    /// <summary>
+    ///     验证Then(Action)应该正确传递yield指令
+    /// </summary>
+    [Test]
+    public void Then_Action_Should_Pass_Through_Yield_Instructions()
+    {
+        var yieldCount = 0;
+
+        var first = CreateTestCoroutine(3);
+        var combined = first.Then(() => { });
+
+        while (combined.MoveNext())
+        {
+            Assert.That(combined.Current, Is.InstanceOf<IYieldInstruction>());
+            yieldCount++;
+        }
+
+        Assert.That(yieldCount, Is.EqualTo(3));
+    }
+
+    /// <summary>
+    ///     验证Then(Action)应该支持链式调用
+    /// </summary>
+    [Test]
+    public void Then_Action_Should_Support_Chaining()
+    {
+        var executionOrder = new List<int>();
+
+        var first = CreateTestCoroutine(1, () => executionOrder.Add(1));
+        var combined = first
+            .Then(() => executionOrder.Add(2))
+            .Then(() => executionOrder.Add(3));
+
+        while (combined.MoveNext())
+        {
+            combined.Current.Update(0.016);
+        }
+
+        Assert.That(executionOrder, Is.EqualTo(new[] { 1, 2, 3 }));
+    }
+
+    /// <summary>
+    ///     验证Then(Action)动作中的异常应该正常抛出
+    /// </summary>
+    [Test]
+    public void Then_Action_Should_Propagate_Exception_From_Action()
+    {
+        var first = CreateTestCoroutine(1);
+        var combined = first.Then(() => throw new InvalidOperationException("Test exception"));
+
+        // 第一步应该正常执行
+        Assert.That(combined.MoveNext(), Is.True);
+        combined.Current.Update(0.016);
+
+        // 动作执行时应该抛出异常
+        Assert.Throws<InvalidOperationException>(() => combined.MoveNext());
+    }
+
+    /// <summary>
+    ///     验证Then(IEnumerator)应该返回有效的协程
+    /// </summary>
+    [Test]
+    public void Then_Coroutine_Should_Return_Valid_Coroutine()
+    {
+        var first = CreateTestCoroutine(1);
+        var second = CreateTestCoroutine(1);
+        var combined = first.Then(second);
+
+        Assert.That(combined, Is.InstanceOf<IEnumerator<IYieldInstruction>>());
+    }
+
+    /// <summary>
+    ///     验证Then(IEnumerator)应该顺序执行两个协程
+    /// </summary>
+    [Test]
+    public void Then_Coroutine_Should_Execute_In_Sequence()
+    {
+        var executionOrder = new List<string>();
+
+        var first = CreateTestCoroutine(2, () => executionOrder.Add("first"));
+        var second = CreateTestCoroutine(2, () => executionOrder.Add("second"));
+        var combined = first.Then(second);
+
+        while (combined.MoveNext())
+        {
+            combined.Current.Update(0.016);
+        }
+
+        Assert.That(executionOrder.Count, Is.EqualTo(4));
+        Assert.That(executionOrder[0], Is.EqualTo("first"));
+        Assert.That(executionOrder[1], Is.EqualTo("first"));
+        Assert.That(executionOrder[2], Is.EqualTo("second"));
+        Assert.That(executionOrder[3], Is.EqualTo("second"));
+    }
+
+    /// <summary>
+    ///     验证Then(IEnumerator)应该正确处理空的第一个协程
+    /// </summary>
+    [Test]
+    public void Then_Coroutine_Should_Handle_Empty_First_Coroutine()
+    {
+        var secondExecuted = false;
+
+        var first = CreateTestCoroutine(0);
+        var second = CreateTestCoroutine(1, () => secondExecuted = true);
+        var combined = first.Then(second);
+
+        // 应该立即开始执行第二个协程
+        Assert.That(combined.MoveNext(), Is.True);
+        combined.Current.Update(0.016);
+        Assert.That(combined.MoveNext(), Is.False);
+
+        Assert.That(secondExecuted, Is.True);
+    }
+
+    /// <summary>
+    ///     验证Then(IEnumerator)应该正确处理空的第二个协程
+    /// </summary>
+    [Test]
+    public void Then_Coroutine_Should_Handle_Empty_Second_Coroutine()
+    {
+        var firstExecuteCount = 0;
+
+        var first = CreateTestCoroutine(2, () => firstExecuteCount++);
+        var second = CreateTestCoroutine(0);
+        var combined = first.Then(second);
+
+        while (combined.MoveNext())
+        {
+            combined.Current.Update(0.016);
+        }
+
+        Assert.That(firstExecuteCount, Is.EqualTo(2));
+    }
+
+    /// <summary>
+    ///     验证Then(IEnumerator)应该正确处理两个空协程
+    /// </summary>
+    [Test]
+    public void Then_Coroutine_Should_Handle_Both_Empty_Coroutines()
+    {
+        var first = CreateTestCoroutine(0);
+        var second = CreateTestCoroutine(0);
+        var combined = first.Then(second);
+
+        Assert.That(combined.MoveNext(), Is.False);
+    }
+
+    /// <summary>
+    ///     验证Then(IEnumerator)应该正确传递所有yield指令
+    /// </summary>
+    [Test]
+    public void Then_Coroutine_Should_Pass_Through_All_Yield_Instructions()
+    {
+        var yieldCount = 0;
+
+        var first = CreateTestCoroutine(3);
+        var second = CreateTestCoroutine(2);
+        var combined = first.Then(second);
+
+        while (combined.MoveNext())
+        {
+            Assert.That(combined.Current, Is.InstanceOf<IYieldInstruction>());
+            yieldCount++;
+        }
+
+        Assert.That(yieldCount, Is.EqualTo(5));
+    }
+
+    /// <summary>
+    ///     验证Then(IEnumerator)应该支持链式调用
+    /// </summary>
+    [Test]
+    public void Then_Coroutine_Should_Support_Chaining()
+    {
+        var executionOrder = new List<int>();
+
+        var first = CreateTestCoroutine(1, () => executionOrder.Add(1));
+        var second = CreateTestCoroutine(1, () => executionOrder.Add(2));
+        var third = CreateTestCoroutine(1, () => executionOrder.Add(3));
+
+        var combined = first.Then(second).Then(third);
+
+        while (combined.MoveNext())
+        {
+            combined.Current.Update(0.016);
+        }
+
+        Assert.That(executionOrder, Is.EqualTo(new[] { 1, 2, 3 }));
+    }
+
+    /// <summary>
+    ///     验证Then应该支持混合链式调用（协程和动作）
+    /// </summary>
+    [Test]
+    public void Then_Should_Support_Mixed_Chaining()
+    {
+        var executionOrder = new List<string>();
+
+        var first = CreateTestCoroutine(1, () => executionOrder.Add("coroutine1"));
+        var second = CreateTestCoroutine(1, () => executionOrder.Add("coroutine2"));
+
+        var combined = first
+            .Then(() => executionOrder.Add("action1"))
+            .Then(second)
+            .Then(() => executionOrder.Add("action2"));
+
+        while (combined.MoveNext())
+        {
+            combined.Current.Update(0.016);
+        }
+
+        Assert.That(executionOrder, Is.EqualTo(new[] { "coroutine1", "action1", "coroutine2", "action2" }));
+    }
+
+    /// <summary>
+    ///     验证Then应该处理带有延迟指令的协程
+    /// </summary>
+    [Test]
+    public void Then_Should_Handle_Delay_Instructions()
+    {
+        var actionExecuted = false;
+
+        IEnumerator<IYieldInstruction> DelayCoroutine()
+        {
+            yield return new Delay(0.5);
+        }
+
+        var combined = DelayCoroutine().Then(() => actionExecuted = true);
+
+        // 第一步返回延迟指令
+        Assert.That(combined.MoveNext(), Is.True);
+        Assert.That(combined.Current, Is.InstanceOf<Delay>());
+
+        // 更新延迟指令直到完成
+        var delay = (Delay)combined.Current;
+        delay.Update(0.5);
+
+        // 完成后执行动作
+        Assert.That(combined.MoveNext(), Is.False);
+        Assert.That(actionExecuted, Is.True);
+    }
+
+    /// <summary>
+    ///     验证Then应该正确处理多层嵌套
+    /// </summary>
+    [Test]
+    public void Then_Should_Handle_Deep_Nesting()
+    {
+        var count = 0;
+
+        var coroutine = CreateTestCoroutine(1, () => count++);
+
+        // 深度嵌套
+        for (var i = 0; i < 10; i++)
+        {
+            var nextCoroutine = CreateTestCoroutine(1, () => count++);
+            coroutine = coroutine.Then(nextCoroutine);
+        }
+
+        while (coroutine.MoveNext())
+        {
+            coroutine.Current.Update(0.016);
+        }
+
+        Assert.That(count, Is.EqualTo(11));
+    }
+}
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