diff --git a/a8k_opt_algo.cpp b/a8k_opt_algo.cpp
index fc8cbed..3567c7f 100644
--- a/a8k_opt_algo.cpp
+++ b/a8k_opt_algo.cpp
@@ -228,16 +228,29 @@ float find_avg_line(vector<float>& inputRaw) {
  *                                                      ALGO_IMPL                                                      *
  ***********************************************************************************************************************/
 
-int32_t findPeakTurnPoint(vector<float>& data, int32_t search_start, int32_t suggest_search_end) {
-  int32_t search_end = 0;
-  for (int32_t i = search_start; i < suggest_search_end; i++) {
-    if (data[i] > m_cxt.agvline) {
-      search_end = i;
+int32_t findPeakStartTurnPoint(vector<float>& data, int32_t search_start, int32_t suggest_search_end) {
+  // int32_t search_end = 0;
+  // for (int32_t i = search_start; i < suggest_search_end; i++) {
+  //   if (data[i] > m_cxt.agvline) {
+  //     search_end = i;
+  //   }
+  // }
+  int32_t search_end  = suggest_search_end;
+  int32_t peakTurnPos = search_start;
+  float   maxdiff2    = m_cxt.diffX2[search_start];
+  for (int32_t i = search_start; i < search_end; i++) {
+    if (m_cxt.diffX2[i] > maxdiff2) {
+      maxdiff2    = m_cxt.diffX2[i];
+      peakTurnPos = i;
     }
   }
+  return peakTurnPos;
+}
 
-  int32_t peakTurnPos = 0;
-  float   maxdiff2    = 0;
+int32_t findPeakEndTurnPoint(vector<float>& data, int32_t search_start, int32_t suggest_search_end) {
+  int32_t search_end = suggest_search_end;
+  int32_t peakTurnPos = search_start;
+  float   maxdiff2    = m_cxt.diffX2[search_start];
   for (int32_t i = search_start; i < search_end; i++) {
     if (m_cxt.diffX2[i] > maxdiff2) {
       maxdiff2    = m_cxt.diffX2[i];
@@ -295,8 +308,8 @@ void findpeak(vector<float>& data, int32_t search_start, int32_t search_end, Pea
   // find_peak_start
   // 从pos向前找20个点，从低于均值线的坐标开始找，找到diff2的最大值
   retpeak.peak_pos       = peakpos;
-  retpeak.peak_start_pos = findPeakTurnPoint(data, peakpos - 20, peakpos) - 4;  //-4 是经验数值
-  retpeak.peak_end_pos   = findPeakTurnPoint(data, peakpos, peakpos + 20) + 4;  //+4 是经验数值
+  retpeak.peak_start_pos = findPeakStartTurnPoint(data, peakpos - 20, peakpos) - 4;  //-4 是经验数值
+  retpeak.peak_end_pos   = findPeakEndTurnPoint(data, peakpos, peakpos + 20) + 4;  //+4 是经验数值
   retpeak.area           = computePeakArea(data, retpeak.peak_start_pos, retpeak.peak_end_pos);
   retpeak.find_peak      = true;