diff --git a/README.md b/README.md
index aaa5f47..3d28496 100644
--- a/README.md
+++ b/README.md
@@ -79,6 +79,8 @@ import (
 
 func main() {
   robotgo.ScrollMouse(10, "up")
+  robogo.MouseClick("left",true)
+  robotgo.MoveMouseSmooth(100, 200, 1.0, 100.0)
 } 
 ``` 
 
diff --git a/README_zh.md b/README_zh.md
index 32ecef6..41667c5 100644
--- a/README_zh.md
+++ b/README_zh.md
@@ -76,6 +76,8 @@ import (
 
 func main() {
   robotgo.ScrollMouse(10, "up")
+  robogo.MouseClick("left",true)
+  robotgo.MoveMouseSmooth(100, 200, 1.0, 100.0)
 } 
 ``` 
 
diff --git a/doc.md b/doc.md
index 17676c8..c1e1940 100644
--- a/doc.md
+++ b/doc.md
@@ -130,6 +130,14 @@ robotgo.MoveMouse(100, 100)
 ####Arguments:
 
     x,y
+    lowspeed,highspeed
+
+####Examples:
+
+```Go
+    robotgo.MoveMouseSmooth(100, 200)
+	robotgo.MoveMouseSmooth(100, 200, 1.0, 100.0)
+```    
 
 ###<h3 id="MouseClick">.MouseClick(button, double)</h3>
 
diff --git a/mouse/goMouse.h b/mouse/goMouse.h
index afba2d1..c21527b 100644
--- a/mouse/goMouse.h
+++ b/mouse/goMouse.h
@@ -63,10 +63,10 @@ int aDragMouse(size_t x, size_t y){
 	return 0;
 }
 
-int aMoveMouseSmooth(size_t x, size_t y){
+int aMoveMouseSmooth(size_t x, size_t y,double lowSpeed,double highSpeed){
 	MMPoint point;
 	point = MMPointMake(x, y);
-	smoothlyMoveMouse(point);
+	smoothlyMoveMouse(point, lowSpeed, highSpeed);
 	microsleep(mouseDelay);
 
 	return 0;
diff --git a/mouse/mouse.h b/mouse/mouse.h
index a32507d..6f7d904 100644
--- a/mouse/mouse.h
+++ b/mouse/mouse.h
@@ -76,7 +76,8 @@ void dragMouse(MMPoint point, const MMMouseButton button);
  *
  * Returns false if unsuccessful (i.e. a point was hit that is outside of the
  * screen boundaries), or true if successful. */
-bool smoothlyMoveMouse(MMPoint point);
+bool smoothlyMoveMouse(MMPoint endPoint, double lowSpeed, double highSpeed); 
+// bool smoothlyMoveMouse(MMPoint point);
 
 /* Returns the coordinates of the mouse on the current screen. */
 MMPoint getMousePos(void);
diff --git a/mouse/mouse_c.h b/mouse/mouse_c.h
index 4c62daa..bf1273e 100644
--- a/mouse/mouse_c.h
+++ b/mouse/mouse_c.h
@@ -327,7 +327,7 @@ static double crude_hypot(double x, double y)
 	return ((M_SQRT2 - 1.0) * small) + big;
 }
 
-bool smoothlyMoveMouse(MMPoint endPoint)
+bool smoothlyMoveMouse(MMPoint endPoint, double lowSpeed, double highSpeed)
 {
 	MMPoint pos = getMousePos();
 	MMSize screenSize = getMainDisplaySize();
@@ -336,7 +336,8 @@ bool smoothlyMoveMouse(MMPoint endPoint)
 
 	while ((distance = crude_hypot((double)pos.x - endPoint.x,
 	                               (double)pos.y - endPoint.y)) > 1.0) {
-		double gravity = DEADBEEF_UNIFORM(5.0, 500.0);
+		// double gravity = DEADBEEF_UNIFORM(5.0, 500.0);
+		double gravity = DEADBEEF_UNIFORM(lowSpeed, highSpeed);
 		double veloDistance;
 		velo_x += (gravity * ((double)endPoint.x - pos.x)) / distance;
 		velo_y += (gravity * ((double)endPoint.y - pos.y)) / distance;
diff --git a/robotgo.go b/robotgo.go
index 04ad138..8a35f65 100644
--- a/robotgo.go
+++ b/robotgo.go
@@ -153,10 +153,25 @@ func DragMouse(x, y int) {
 	C.aDragMouse(cx, cy)
 }
 
-func MoveMouseSmooth(x, y int) {
+func MoveMouseSmooth(x, y int, args ...float64) {
 	cx := C.size_t(x)
 	cy := C.size_t(y)
-	C.aMoveMouseSmooth(cx, cy)
+
+	var (
+		low  C.double
+		high C.double
+	)
+
+	Try(func() {
+		low = C.double(args[2])
+		high = C.double(args[3])
+	}, func(e interface{}) {
+		// Println("err:::", e)
+		low = 5.0
+		high = 500.0
+	})
+
+	C.aMoveMouseSmooth(cx, cy, low, high)
 }
 
 func GetMousePos() (int, int) {
diff --git a/zh_doc.md b/zh_doc.md
index e8eb7ad..df79c1c 100644
--- a/zh_doc.md
+++ b/zh_doc.md
@@ -137,6 +137,14 @@ robotgo.MoveMouse(100, 100)
 ####参数:
 
     x,y
+    lowspeed,highspeed
+
+####例子:
+
+```Go
+    robotgo.MoveMouseSmooth(100, 200)
+	robotgo.MoveMouseSmooth(100, 200, 1.0, 100.0)
+```       
 
 ###<h3 id="MouseClick">.MouseClick(button, double)</h3>
     鼠标点击