diff --git a/hikyuu_cpp/hikyuu/indicator/imp/IHhvbars.cpp b/hikyuu_cpp/hikyuu/indicator/imp/IHhvbars.cpp
index 48741266..afb46e3d 100644
--- a/hikyuu_cpp/hikyuu/indicator/imp/IHhvbars.cpp
+++ b/hikyuu_cpp/hikyuu/indicator/imp/IHhvbars.cpp
@@ -63,29 +63,26 @@ void IHhvbars::_calculate(const Indicator& ind) {
         _set(i - pre_pos, i);
     }
 
-    for (size_t i = start_pos; i < total - 1; i++) {
+    for (size_t i = start_pos; i < total; i++) {
         size_t j = i + 1 - n;
         if (pre_pos < j) {
             pre_pos = j;
             max = ind[j];
-        }
-        if (ind[i] >= max) {
-            max = ind[i];
-            pre_pos = i;
+            for (size_t j = pre_pos + 1; j <= i; j++) {
+                if (ind[j] >= max) {
+                    max = ind[j];
+                    pre_pos = j;
+                }
+            }
+
+        } else {
+            if (ind[i] >= max) {
+                max = ind[i];
+                pre_pos = i;
+            }
         }
         _set(i - pre_pos, i);
     }
-
-    start_pos = total - n;
-    max = ind[start_pos];
-    pre_pos = start_pos;
-    for (size_t i = start_pos; i < total; i++) {
-        if (ind[i] >= max) {
-            pre_pos = i;
-            max = ind[i];
-        }
-    }
-    _set(total - pre_pos - 1, total - 1);
 }
 
 Indicator HKU_API HHVBARS(int n) {
diff --git a/hikyuu_cpp/hikyuu/indicator/imp/IHighLine.cpp b/hikyuu_cpp/hikyuu/indicator/imp/IHighLine.cpp
index 2d6623ef..cfc6b177 100644
--- a/hikyuu_cpp/hikyuu/indicator/imp/IHighLine.cpp
+++ b/hikyuu_cpp/hikyuu/indicator/imp/IHighLine.cpp
@@ -71,7 +71,7 @@ void IHighLine::_calculate(const Indicator& ind) {
             pre_pos = j;
             max = ind[j];
             for (size_t j = pre_pos + 1; j <= i; j++) {
-                if (ind[j] > max) {
+                if (ind[j] >= max) {
                     max = ind[j];
                     pre_pos = j;
                 }
diff --git a/hikyuu_cpp/hikyuu/indicator/imp/ILowLine.cpp b/hikyuu_cpp/hikyuu/indicator/imp/ILowLine.cpp
index 14613c47..48488e94 100644
--- a/hikyuu_cpp/hikyuu/indicator/imp/ILowLine.cpp
+++ b/hikyuu_cpp/hikyuu/indicator/imp/ILowLine.cpp
@@ -70,22 +70,20 @@ void ILowLine::_calculate(const Indicator& ind) {
         if (pre_pos < j) {
             pre_pos = j;
             min = ind[j];
-        }
-        if (ind[i] <= min) {
-            min = ind[i];
-            pre_pos = i;
+            for (size_t j = pre_pos + 1; j <= i; j++) {
+                if (ind[j] <= min) {
+                    min = ind[j];
+                    pre_pos = j;
+                }
+            }
+        } else {
+            if (ind[i] <= min) {
+                min = ind[i];
+                pre_pos = i;
+            }
         }
         _set(min, i);
     }
-
-    startPos = total - n;
-    min = ind[startPos];
-    for (size_t i = startPos; i < total; i++) {
-        if (ind[i] <= min) {
-            min = ind[i];
-        }
-    }
-    _set(min, total - 1);
 }
 
 Indicator HKU_API LLV(int n = 20) {
diff --git a/hikyuu_cpp/hikyuu/indicator/imp/ILowLineBars.cpp b/hikyuu_cpp/hikyuu/indicator/imp/ILowLineBars.cpp
index 346c78b6..bfcccdc2 100644
--- a/hikyuu_cpp/hikyuu/indicator/imp/ILowLineBars.cpp
+++ b/hikyuu_cpp/hikyuu/indicator/imp/ILowLineBars.cpp
@@ -63,29 +63,25 @@ void ILowLineBars::_calculate(const Indicator& ind) {
         _set(i - pre_pos, i);
     }
 
-    for (size_t i = start_pos; i < total - 1; i++) {
+    for (size_t i = start_pos; i < total; i++) {
         size_t j = i + 1 - n;
         if (pre_pos < j) {
             pre_pos = j;
             min = ind[j];
-        }
-        if (ind[i] <= min) {
-            min = ind[i];
-            pre_pos = i;
+            for (size_t j = pre_pos + 1; j <= i; j++) {
+                if (ind[j] <= min) {
+                    min = ind[j];
+                    pre_pos = j;
+                }
+            }
+        } else {
+            if (ind[i] <= min) {
+                min = ind[i];
+                pre_pos = i;
+            }
         }
         _set(i - pre_pos, i);
     }
-
-    start_pos = total - n;
-    min = ind[start_pos];
-    pre_pos = start_pos;
-    for (size_t i = start_pos; i < total; i++) {
-        if (ind[i] <= min) {
-            pre_pos = i;
-            min = ind[i];
-        }
-    }
-    _set(total - pre_pos - 1, total - 1);
 }
 
 Indicator HKU_API LLVBARS(int n) {
diff --git a/xmake.lua b/xmake.lua
index edf59031..6a06fe3b 100644
--- a/xmake.lua
+++ b/xmake.lua
@@ -4,6 +4,9 @@ set_xmakever("2.5.4")
 set_project("hikyuu")
 
 add_rules("mode.debug", "mode.release")
+if not is_plat("windows") then 
+    add_rules("mode.coverage")
+end
 
 -- version
 set_version("1.1.9", {build="%Y%m%d%H%M"})