diff --git a/XYParser/XYEegParserExample.cpp b/XYParser/XYEegParserExample.cpp
index 7c5b008..e9efa0a 100644
--- a/XYParser/XYEegParserExample.cpp
+++ b/XYParser/XYEegParserExample.cpp
@@ -7,7 +7,7 @@
 
 namespace {
 
-std::vector<std::uint8_t> BuildMinimalFrame(std::uint8_t channel_count)
+std::vector<std::uint8_t> BuildMinimalFrame(std::uint8_t channel_count, std::uint32_t frame_index)
 {
     constexpr std::size_t kSamplesPerFrame = 5;
     constexpr std::uint8_t kHeader = 0xAA;
@@ -24,10 +24,10 @@ std::vector<std::uint8_t> BuildMinimalFrame(std::uint8_t channel_count)
     frame[offset++] = kHeader;
 
     // index, little endian
-    frame[offset++] = 0x01;
-    frame[offset++] = 0x00;
-    frame[offset++] = 0x00;
-    frame[offset++] = 0x00;
+    frame[offset++] = static_cast<std::uint8_t>(frame_index & 0xFF);
+    frame[offset++] = static_cast<std::uint8_t>((frame_index >> 8) & 0xFF);
+    frame[offset++] = static_cast<std::uint8_t>((frame_index >> 16) & 0xFF);
+    frame[offset++] = static_cast<std::uint8_t>((frame_index >> 24) & 0xFF);
 
     // payload length, big endian
     frame[offset++] = static_cast<std::uint8_t>((payload_length >> 8) & 0xFF);
@@ -57,6 +57,11 @@ std::vector<std::uint8_t> BuildMinimalFrame(std::uint8_t channel_count)
     return frame;
 }
 
+std::vector<std::uint8_t> BuildMinimalFrame(std::uint8_t channel_count)
+{
+    return BuildMinimalFrame(channel_count, 1U);
+}
+
 } // namespace
 
 void MinimalExampleFor8ChParser()
diff --git a/XYParser/XYParserTests/Tests.cpp b/XYParser/XYParserTests/Tests.cpp
index c4c126c..e83c6ac 100644
--- a/XYParser/XYParserTests/Tests.cpp
+++ b/XYParser/XYParserTests/Tests.cpp
@@ -43,8 +43,9 @@ private:
 /// 构建最小帧数据的辅助函数
 /// 生成符合 XYParser 协议格式的测试帧数据
 /// @param channel_count 通道数量
+/// @param frame_index 帧索引，小端写入标签区前 4 字节
 /// @return 包含完整帧数据的字节向量
-std::vector<std::uint8_t> BuildMinimalFrame(std::uint8_t channel_count)
+std::vector<std::uint8_t> BuildMinimalFrame(std::uint8_t channel_count, std::uint32_t frame_index)
 {
     constexpr std::size_t kSamplesPerFrame = 5;  ///< 每帧采样数
     constexpr std::uint8_t kHeader = 0xAA;       ///< 帧头标记
@@ -62,11 +63,11 @@ std::vector<std::uint8_t> BuildMinimalFrame(std::uint8_t channel_count)
     // 写入帧头
     frame[offset++] = kHeader;
 
-    // 写入标签数据（版本号等）
-    frame[offset++] = 0x01;
-    frame[offset++] = 0x00;
-    frame[offset++] = 0x00;
-    frame[offset++] = 0x00;
+    // 写入标签数据中的帧索引（小端序）
+    frame[offset++] = static_cast<std::uint8_t>(frame_index & 0xFF);
+    frame[offset++] = static_cast<std::uint8_t>((frame_index >> 8) & 0xFF);
+    frame[offset++] = static_cast<std::uint8_t>((frame_index >> 16) & 0xFF);
+    frame[offset++] = static_cast<std::uint8_t>((frame_index >> 24) & 0xFF);
 
     // 写入负载长度（大端序）
     frame[offset++] = static_cast<std::uint8_t>((payload_length >> 8) & 0xFF);
@@ -99,6 +100,12 @@ std::vector<std::uint8_t> BuildMinimalFrame(std::uint8_t channel_count)
     return frame;
 }
 
+/// 为现有调用点保留默认 frame_index=1 的便捷重载
+std::vector<std::uint8_t> BuildMinimalFrame(std::uint8_t channel_count)
+{
+    return BuildMinimalFrame(channel_count, 1U);
+}
+
 } // namespace
 
 /// 测试：创建解析器时拒绝不支持的通道数
@@ -336,8 +343,8 @@ TEST(XYParserApiTests, FeedParsesMultipleFrames)
     XYParser_SetBypassChecksum(parser.get(), 1);
 
     // 构建两个连续的帧
-    const std::vector<std::uint8_t> frame1 = BuildMinimalFrame(8);
-    const std::vector<std::uint8_t> frame2 = BuildMinimalFrame(8);
+    const std::vector<std::uint8_t> frame1 = BuildMinimalFrame(8, 1U);
+    const std::vector<std::uint8_t> frame2 = BuildMinimalFrame(8, 2U);
 
     std::vector<std::uint8_t> combined(frame1);
     combined.insert(combined.end(), frame2.begin(), frame2.end());
@@ -368,7 +375,7 @@ TEST(XYParserApiTests, FeedIncrementsFrameIndex)
     int total_frames = 0;
 
     for (int i = 0; i < 3; ++i) {
-        const std::vector<std::uint8_t> frame = BuildMinimalFrame(8);
+        const std::vector<std::uint8_t> frame = BuildMinimalFrame(8, static_cast<std::uint32_t>(i + 1));
         const int count = XYParser_Feed(
             parser.get(),
             frame.data(),
@@ -477,4 +484,4 @@ TEST(XYParserApiTests, GetLastErrorReturnsMessageForNullParser)
 {
     EXPECT_EQ(std::string(XYParser_GetLastError(nullptr)), std::string("invalid parser handle"));
 }
-*/
\ No newline at end of file
+*/