diff --git a/math/TransformBenchmark.cpp b/math/TransformBenchmark.cpp
index 08d6efb..bf7ba0e 100644
--- a/math/TransformBenchmark.cpp
+++ b/math/TransformBenchmark.cpp
@@ -49,7 +49,7 @@ int main(int,char **)
 
     tp=t;
 
-    st=GetDoubleTime();
+    st=GetPreciseTime();
     for(int i=0;i<TEST_COUNT;i++)
     {
         *m=tp->GetMatrix();
@@ -57,7 +57,7 @@ int main(int,char **)
         ++tp;
         ++m;
     }
-    et=GetDoubleTime();
+    et=GetPreciseTime();
 
     std::cout<<"Transform::GetMatrix() "<<TEST_COUNT<<" time: "<<et-st<<"sec."<<std::endl;
     return 0;
diff --git a/pick/Pick2DTest.cpp b/pick/Pick2DTest.cpp
index cf6c1bd..3f40bbb 100644
--- a/pick/Pick2DTest.cpp
+++ b/pick/Pick2DTest.cpp
@@ -66,7 +66,7 @@ void Pick2DTriangle()
     draw.DrawLine(v[1],v[2]);
     draw.DrawLine(v[2],v[0]);
 
-    double st=GetDoubleTime();
+    double st=GetPreciseTime();
 
     for(int i=0;i<10000;i++)
     {
@@ -81,7 +81,7 @@ void Pick2DTriangle()
         draw.PutPixel(t);
     }
 
-    double et=GetDoubleTime();
+    double et=GetPreciseTime();
 
     std::cout<<"test 10000 points in a triangle cost "<<(et-st)<<" seconds."<<std::endl;
 
diff --git a/time/time_count.cpp b/time/time_count.cpp
index 29644d5..15c9a98 100644
--- a/time/time_count.cpp
+++ b/time/time_count.cpp
@@ -10,7 +10,7 @@ constexpr const size_t TIME_OUT_FRAC=6;     //小数输出位数
 
 int main(int,char **)
 {
-    const double cur_time=GetDoubleTime();
+    const double cur_time=GetPreciseTime();
 
     Date d;
     Time t;
diff --git a/utils/HashTest.cpp b/utils/HashTest.cpp
index 5d93dc5..1aab590 100644
--- a/utils/HashTest.cpp
+++ b/utils/HashTest.cpp
@@ -39,13 +39,13 @@ int os_main(int argc,os_char **argv)
 
         hash_code=new char[hash_length];
 
-        start_time=GetDoubleTime();
+        start_time=GetPreciseTime();
 
         h->Init();
         h->Update(file_data,file_length);
         h->Final(hash_code);
 
-        end_time=GetDoubleTime();
+        end_time=GetPreciseTime();
 
         ToLowerHexStr(hash_str,hash_code,hash_length);