diff --git a/Assets/Resources/AudioData/MusicContainer.bytes b/Assets/Resources/AudioData/MusicContainer.bytes
index 8808722..826947d 100644
Binary files a/Assets/Resources/AudioData/MusicContainer.bytes and b/Assets/Resources/AudioData/MusicContainer.bytes differ
diff --git a/Assets/Resources/AudioData/MusicPath.bytes b/Assets/Resources/AudioData/MusicPath.bytes
index a426cfe..f2e27c2 100644
Binary files a/Assets/Resources/AudioData/MusicPath.bytes and b/Assets/Resources/AudioData/MusicPath.bytes differ
diff --git a/Assets/Resources/AudioData/MusicSegment.bytes b/Assets/Resources/AudioData/MusicSegment.bytes
index fbfd69b..9f38ed9 100644
Binary files a/Assets/Resources/AudioData/MusicSegment.bytes and b/Assets/Resources/AudioData/MusicSegment.bytes differ
diff --git a/Assets/Resources/AudioData/MusicTransition.bytes b/Assets/Resources/AudioData/MusicTransition.bytes
index 1aa12d8..1a1b5df 100644
Binary files a/Assets/Resources/AudioData/MusicTransition.bytes and b/Assets/Resources/AudioData/MusicTransition.bytes differ
diff --git a/Assets/Resources/Audios/30-number-1.wav b/Assets/Resources/Audios/30-number-1.wav
new file mode 100644
index 0000000..3643859
Binary files /dev/null and b/Assets/Resources/Audios/30-number-1.wav differ
diff --git a/Assets/Resources/Audios/30-number-1.wav.meta b/Assets/Resources/Audios/30-number-1.wav.meta
new file mode 100644
index 0000000..51e0189
--- /dev/null
+++ b/Assets/Resources/Audios/30-number-1.wav.meta
@@ -0,0 +1,23 @@
+fileFormatVersion: 2
+guid: 534256c3d6f404a2f9c8c21a637da590
+AudioImporter:
+  externalObjects: {}
+  serializedVersion: 7
+  defaultSettings:
+    serializedVersion: 2
+    loadType: 0
+    sampleRateSetting: 0
+    sampleRateOverride: 44100
+    compressionFormat: 1
+    quality: 1
+    conversionMode: 0
+    preloadAudioData: 0
+  platformSettingOverrides: {}
+  forceToMono: 0
+  normalize: 1
+  loadInBackground: 0
+  ambisonic: 0
+  3D: 1
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/Resources/Audios/30-number-2.wav b/Assets/Resources/Audios/30-number-2.wav
new file mode 100644
index 0000000..9bced9e
Binary files /dev/null and b/Assets/Resources/Audios/30-number-2.wav differ
diff --git a/Assets/Resources/Audios/30-number-2.wav.meta b/Assets/Resources/Audios/30-number-2.wav.meta
new file mode 100644
index 0000000..169f319
--- /dev/null
+++ b/Assets/Resources/Audios/30-number-2.wav.meta
@@ -0,0 +1,23 @@
+fileFormatVersion: 2
+guid: 9575587d5b2674abdb50a85876af1cff
+AudioImporter:
+  externalObjects: {}
+  serializedVersion: 7
+  defaultSettings:
+    serializedVersion: 2
+    loadType: 0
+    sampleRateSetting: 0
+    sampleRateOverride: 44100
+    compressionFormat: 1
+    quality: 1
+    conversionMode: 0
+    preloadAudioData: 0
+  platformSettingOverrides: {}
+  forceToMono: 0
+  normalize: 1
+  loadInBackground: 0
+  ambisonic: 0
+  3D: 1
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/Resources/Audios/30-number-3.wav b/Assets/Resources/Audios/30-number-3.wav
new file mode 100644
index 0000000..06a3728
Binary files /dev/null and b/Assets/Resources/Audios/30-number-3.wav differ
diff --git a/Assets/Resources/Audios/30-number-3.wav.meta b/Assets/Resources/Audios/30-number-3.wav.meta
new file mode 100644
index 0000000..6353629
--- /dev/null
+++ b/Assets/Resources/Audios/30-number-3.wav.meta
@@ -0,0 +1,23 @@
+fileFormatVersion: 2
+guid: 72b8b58741dfc4283888c0db8fc50b85
+AudioImporter:
+  externalObjects: {}
+  serializedVersion: 7
+  defaultSettings:
+    serializedVersion: 2
+    loadType: 0
+    sampleRateSetting: 0
+    sampleRateOverride: 44100
+    compressionFormat: 1
+    quality: 1
+    conversionMode: 0
+    preloadAudioData: 0
+  platformSettingOverrides: {}
+  forceToMono: 0
+  normalize: 1
+  loadInBackground: 0
+  ambisonic: 0
+  3D: 1
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/Resources/Audios/30-number-4.wav b/Assets/Resources/Audios/30-number-4.wav
new file mode 100644
index 0000000..8e9126f
Binary files /dev/null and b/Assets/Resources/Audios/30-number-4.wav differ
diff --git a/Assets/Resources/Audios/30-number-4.wav.meta b/Assets/Resources/Audios/30-number-4.wav.meta
new file mode 100644
index 0000000..ce0bfb8
--- /dev/null
+++ b/Assets/Resources/Audios/30-number-4.wav.meta
@@ -0,0 +1,23 @@
+fileFormatVersion: 2
+guid: e9950b0e480f34857949541778727e30
+AudioImporter:
+  externalObjects: {}
+  serializedVersion: 7
+  defaultSettings:
+    serializedVersion: 2
+    loadType: 0
+    sampleRateSetting: 0
+    sampleRateOverride: 44100
+    compressionFormat: 1
+    quality: 1
+    conversionMode: 0
+    preloadAudioData: 0
+  platformSettingOverrides: {}
+  forceToMono: 0
+  normalize: 1
+  loadInBackground: 0
+  ambisonic: 0
+  3D: 1
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/Scenes/SampleScene.unity b/Assets/Scenes/SampleScene.unity
index 55be1e6..f928f9b 100644
--- a/Assets/Scenes/SampleScene.unity
+++ b/Assets/Scenes/SampleScene.unity
@@ -411,7 +411,7 @@ MonoBehaviour:
   m_Script: {fileID: 11500000, guid: 2ce47fe7df364a8fa37501256e5b5155, type: 3}
   m_Name: 
   m_EditorClassIdentifier: 
-  targetGameState: 1
+  targetGameState: 4
   enableLowpass: 0
   buttonText: {fileID: 17265520}
 --- !u!114 &392790006
@@ -1961,7 +1961,7 @@ MonoBehaviour:
   m_Script: {fileID: 11500000, guid: 2ce47fe7df364a8fa37501256e5b5155, type: 3}
   m_Name: 
   m_EditorClassIdentifier: 
-  targetGameState: 4
+  targetGameState: 5
   enableLowpass: 0
   buttonText: {fileID: 519563562}
 --- !u!114 &1542973985
diff --git a/Assets/Scripts/OCES/Audio/Generated/AudioConsts.cs b/Assets/Scripts/OCES/Audio/Generated/AudioConsts.cs
index e470b83..decae6a 100644
--- a/Assets/Scripts/OCES/Audio/Generated/AudioConsts.cs
+++ b/Assets/Scripts/OCES/Audio/Generated/AudioConsts.cs
@@ -118,7 +118,8 @@ namespace OCES.Audio
 			Game, // 关卡内
 			Win, // 胜利
 			Lose, // 失败
-			Test,
+			Test_A,
+			Test_B,
 		}
 
 	} //public class Parameters
diff --git a/StartOffset 测试清单.md b/StartOffset 测试清单.md
new file mode 100644
index 0000000..95e22a4
--- /dev/null
+++ b/StartOffset 测试清单.md	
@@ -0,0 +1,84 @@
+## 测试清单
+
+### 测试优先级
+
+1. ~~**P0 冒烟**：#1, #2, #5, #25（核心路径 + 回归）~~
+2. **P1 功能**：#9, #10, #13, #14, #16, #20（SyncPoint + BeatClock + Align）
+3. **P2 边界**：#3, #4, #11, #18, #19, #23, #28, #29
+4. **P3 回归**：#6, #7, #8, #12, #15, #17, #21, #22, #26, #27, #30, #31
+
+### 一、StartOffset 核心功能
+
+| # | 测试场景 | 验证点 | 是否通过 |
+|---|---------|-------|:--------:|
+| 1 | 播放 StartOffset=5s 的 Segment | AudioClip 从 0 开始播放（可听到前奏）；BeatClock 在 5s 后才触发第一次 Beat 回调 | ✅
+| 2 | 播放 StartOffset=0 的 Segment | 行为与改动前完全一致 | ✅
+| 3 | StartOffset + EndOffset 组合 | 播放到 `clip.length - EndOffset` 时 Segment 逻辑结束，物理播放继续到自然结束 |
+| 4 | StartOffset 值大于 Clip 长度 | 应有合理降级（当前为 TODO，至少不崩溃） |
+
+### 二、循环播放
+
+| # | 测试场景 | 验证点 | 是否通过 |
+|---|---------|--------|:--------:|
+| 5 | LoopCount=-1，StartOffset=5s | 第一轮从 0 播放；第二轮及之后从 5s 开始播放 | ✅
+| 6 | LoopCount=2，StartOffset=5s | 第一轮从 0 播放，第二轮从 5s 开始，播满 2 轮后停止 |
+| 7 | LoopCount=-1，StartOffset=0 | 行为与改动前完全一致 |
+| 8 | 循环时 BeatClock | 每次循环 BeatClock 重新启动，逻辑时间从 0 重新开始计数 |
+
+### 三、SyncPoint.SameAsCurrentSegment
+
+| # | 测试场景 | 验证点 | 是否通过 |
+|---|---------|--------|:--------:|
+| 9 | 旧 Container StartOffset=5s，播放到 15s 时切换；新 Container StartOffset=3s | 逻辑时长=15-5=10s；新位置=10+3=13s；新 AudioSource.timeSamples 对应 13s | ✅ |
+| 10 | 旧 Container StartOffset=5s，播放到 3s 时切换（还没过 StartOffset） | 新 Container 从自身 StartOffset 开始播放 | ✅ |
+| 11 | 计算出新位置 < 新 StartOffset | 新 Container 从自身 StartOffset 开始播放 |
+| 12 | 旧 Container 无 StartOffset，新 Container 有 StartOffset | 旧 SourceStartOffset=0，计算逻辑正确 |
+
+### 四、SyncPoint.Start
+
+| # | 测试场景 | 验证点 | 是否通过 |
+|---|---------|--------|:--------:|
+| 13 | StartOffset=5s，FadeInTime=2s | AudioSource 从 3s 开始播放（5-2=3），淡入 2s 后刚好到 5s |
+| 14 | StartOffset=1s，FadeInTime=3s | StartPlayTime=1-3=-2→0，从头开始淡入，忽略 StartOffset |
+| 15 | StartOffset=5s，FadeInTime=0 | StartPlayTime=5，从 5s 开始播放（无淡入） |
+
+### 五、BeatClock 延迟启动
+
+| # | 测试场景 | 验证点 | 是否通过 |
+|---|---------|--------|:--------:|
+| 16 | 首次启动 StartOffset=5s | BeatClock 等 5s 后才触发首次 Beat 回调 |
+| 17 | 首次启动 StartOffset=0 | BeatClock 立即启动，行为不变 |
+| 18 | 延迟期间调用 Stop() | BeatClock 立即停止，不触发任何回调 |
+| 19 | SameAsCurrentSegment 切换时逻辑起点已过 | BeatClock 立即启动（delay<=0），从正确的逻辑时间继续 |
+
+### 六、对齐（AlignMode）
+
+| # | 测试场景 | 验证点 | 是否通过 |
+|---|---------|--------|:--------:|
+| 20 | AlignMode.Beat，StartOffset=5s | 对齐基于逻辑起点（m_startDspTime = dspTime + 5），不是物理起点 |
+| 21 | AlignMode.Bar，StartOffset=5s | 同上 |
+| 22 | 在 StartOffset 延迟期间调用 GetNextDspTime | 返回 m_startDspTime（逻辑起点），不会返回过去的时间 |
+
+### 七、Blend Container
+
+| # | 测试场景 | 验证点 | 是否通过 |
+|---|---------|--------|:--------:|
+| 23 | Blend Container 的子 Segment 有 StartOffset | GetEffectiveStartOffset 返回 0，isLoop=false，行为与改动前一致 |
+| 24 | SyncPoint.SameAsCurrentSegment 降级 | Blend 不支持 SameAsCurrentSegment，降级为 Start（原有行为不变） |
+
+### 八、回归测试（无 StartOffset 时行为不变）
+
+| # | 测试场景 | 验证点 | 是否通过 
+|---|---------|--------|:---:|
+| 25 | 所有 Segment 的 StartOffset=0，EndOffset=0 | 全流程与改动前一致：播放、循环、切换、SyncPoint、FadeIn/Out | ✅
+| 26 | Segment 只有 EndOffset，无 StartOffset | WaitSegmentFinish 到达 effectiveTime 后通知 container 推进 |
+| 27 | AmbienceChannelPlayer | 不涉及 BeatClock，StartOffset 仅影响 PlaySegment 的 isLoop 跳转，需确认无副作用 |
+
+### 九、Sequence/Random Container 内多个 Segment
+
+| # | 测试场景 | 验证点 | 是否通过 |
+|---|---------|--------|:--------:|
+| 28 | Sequence Container，3 个 Segment 各有不同 StartOffset，首次播放 | 所有 Segment 从 0 开始播放 |
+| 29 | 同上，LoopCount=-1 | 第二轮起所有 Segment 从各自 StartOffset 开始 |
+| 30 | Random Container，循环时 | 选中 Segment 从其 StartOffset 开始 |
+| 31 | Step Sequence Container | 每次切 Segment 时 isLoop 传递正确 |
\ No newline at end of file
diff --git a/commit message draft.md b/commit message draft.md
new file mode 100644
index 0000000..93fcc8c
--- /dev/null
+++ b/commit message draft.md	
@@ -0,0 +1,4 @@
+feat: StartOffset
+
+- 实现startOffset
+- 修复EndOffset = 0 + 循环播放时，音乐会大量重复播放的错误
\ No newline at end of file