diff --git a/sourceCode/wheelArchHeigthMeasure.cpp b/sourceCode/wheelArchHeigthMeasure.cpp
index d788fd4..8c85a08 100644
--- a/sourceCode/wheelArchHeigthMeasure.cpp
+++ b/sourceCode/wheelArchHeigthMeasure.cpp
@@ -16,7 +16,8 @@
 //version 1.3.5 : 改进轮眉取点方法。
 //version 1.3.6 : 轮眉到轮心高度计算方法进行了修正，重新从由两点距离修改为Y高度差。
 //version 1.4.0 : 添加了标定块凹槽长度计算API。
-std::string	m_strVersion = "1.4.0";
+//version 1.4.1 : 优化了标定块凹槽长度计算方法，使用前部1/4和后部1/4点计算，跳开中间波动比较大的点。
+std::string	m_strVersion = "1.4.1";
 const char* wd_wheelArchHeigthMeasureVersion(void)
 {
 	return m_strVersion.c_str();
@@ -1215,27 +1216,31 @@ double wd_getCalibrationBlockLength(
 			validLines.push_back(lineData);
 	}
 
-	double sumGaugeLen = 0;
-	int sumSize = 0;
+	std::vector<double> gaugeLen;
 	int validLineNum = (int)validLines.size();
 	for (int i = 0; i < validLineNum; i++)
 	{
 		int validLinePtNum = (int)validLines[i].size();
 		SVzNL3DPosition first_pt = validLines[i][0];
 		SVzNL3DPosition last_pt = validLines[i].back();
+		int midPtIdx_0 = validLinePtNum / 4;
+		int midPtIdx_1 = (validLinePtNum * 3) / 4;
+		SVzNL3DPosition mid_pt0 = validLines[i][midPtIdx_0];
+		SVzNL3DPosition mid_pt1 = validLines[i][midPtIdx_1];
 		double totalLen = sqrt(pow(first_pt.pt3D.x - last_pt.pt3D.x, 2) + pow(first_pt.pt3D.y - last_pt.pt3D.y, 2) + pow(first_pt.pt3D.z - last_pt.pt3D.z, 2));
 		double lenDiff = abs(nominalTotalLen - totalLen);
 		if ( (lenDiff < 10) &&(validLinePtNum>100))
 		{
 			//计算凹槽长度
-			double _a = 0, _b = 0, _c = 0;
-			compute2ptLine_2(first_pt.pt3D.y, first_pt.pt3D.z, last_pt.pt3D.y, last_pt.pt3D.z, &_a, &_b, &_c);
-			
+			double _a1 = 0, _b1 = 0, _c1 = 0;
+			compute2ptLine_2(first_pt.pt3D.y, first_pt.pt3D.z, mid_pt0.pt3D.y, mid_pt0.pt3D.z, &_a1, &_b1, &_c1);
+			double _a2 = 0, _b2 = 0, _c2 = 0;
+			compute2ptLine_2(mid_pt1.pt3D.y, mid_pt1.pt3D.z, last_pt.pt3D.y, last_pt.pt3D.z, &_a2, &_b2, &_c2);
 			SVzNL3DPosition peakPt_1 = { 0, 0, 0 };
 			double maxLen_1 = -1;
-			for (int j = 0; j < validLinePtNum / 2; j++)
+			for (int j = 0; j < midPtIdx_0; j++)
 			{
-				double len = computePtDistToLine(validLines[i][j].pt3D.y, validLines[i][j].pt3D.z, _a, _b, _c);
+				double len = computePtDistToLine(validLines[i][j].pt3D.y, validLines[i][j].pt3D.z, _a1, _b1, _c1);
 				if (maxLen_1 < len)
 				{
 					peakPt_1 = validLines[i][j];
@@ -1245,9 +1250,9 @@ double wd_getCalibrationBlockLength(
 
 			SVzNL3DPosition peakPt_2 = { 0, 0, 0 };
 			double maxLen_2 = -1;
-			for (int j = validLinePtNum / 2; j < validLinePtNum; j++)
+			for (int j = midPtIdx_1; j < validLinePtNum; j++)
 			{
-				double len = computePtDistToLine(validLines[i][j].pt3D.y, validLines[i][j].pt3D.z, _a, _b, _c);
+				double len = computePtDistToLine(validLines[i][j].pt3D.y, validLines[i][j].pt3D.z, _a2, _b2, _c2);
 				if (maxLen_2 < len)
 				{
 					peakPt_2 = validLines[i][j];
@@ -1258,8 +1263,7 @@ double wd_getCalibrationBlockLength(
 			if ((maxLen_1 > 2.0) && (maxLen_2 > 2.0))
 			{
 				double vLen = sqrt(pow(peakPt_1.pt3D.x - peakPt_2.pt3D.x, 2) + pow(peakPt_1.pt3D.y - peakPt_2.pt3D.y, 2) + pow(peakPt_1.pt3D.z - peakPt_2.pt3D.z, 2));
-				sumGaugeLen += vLen;
-				sumSize++;
+				gaugeLen.push_back(vLen);
 #if _OUTPUT_DEBUG_DATA
 				int nPtIdx_1 = peakPt_1.nPointIdx;
 				int lineIdx_1 = nPtIdx_1 >> 16;
@@ -1273,12 +1277,20 @@ double wd_getCalibrationBlockLength(
 			}
 		}
 	}
-	if (sumSize == 0)
+
+	if (gaugeLen.size() <=  3)
 {
 		*errCode = SX_ERR_ZERO_OBJECTS;
 		return -1;
 	}
-	
+	//去除头尾
+	double sumGaugeLen = 0;
+	int sumSize = 0;
+	for(int i = 1; i < (int)gaugeLen.size()-1; i ++)
+	{
+		sumGaugeLen += gaugeLen[i];
+		sumSize++;
+	}
 	sumGaugeLen = sumGaugeLen / sumSize;
 	return sumGaugeLen;
 }
\ No newline at end of file
diff --git a/wheelArchHeigthMeasure_test/wheelArchHeigthMeasure_test.cpp b/wheelArchHeigthMeasure_test/wheelArchHeigthMeasure_test.cpp
index 910451c..e4eaa38 100644
--- a/wheelArchHeigthMeasure_test/wheelArchHeigthMeasure_test.cpp
+++ b/wheelArchHeigthMeasure_test/wheelArchHeigthMeasure_test.cpp
@@ -2968,7 +2968,7 @@ int main()
 
 	char _scan_file[256];
 
-	for (int grp = 0; grp <= 3; grp++)
+	for (int grp = 2; grp <= 3; grp++)
 	{
 		for (int fidx = fileIdx[grp].nMin; fidx <= fileIdx[grp].nMax; fidx++)
 		{
@@ -2995,10 +2995,10 @@ int main()
 			filterParam.outlierTh = 5;
 
 			SSG_treeGrowParam growParam;
-			growParam.maxLineSkipNum = 10;
-			growParam.yDeviation_max = 20.0;
-			growParam.maxSkipDistance = 10.0;
-			growParam.zDeviation_max = 20.0;// 
+			growParam.maxLineSkipNum = 5;
+			growParam.yDeviation_max = 5.0;
+			growParam.maxSkipDistance = 5.0;
+			growParam.zDeviation_max = 5.0;// 
 			growParam.minLTypeTreeLen = 100; //mm
 			growParam.minVTypeTreeLen = 100; //mm
 			SVzNLRangeD calibratiionBlockYRange = { -1000, 500 };