diff --git a/avlindex/avlindex.go b/avlindex/avlindex.go
index 9759641..0ca3586 100644
--- a/avlindex/avlindex.go
+++ b/avlindex/avlindex.go
@@ -333,14 +333,15 @@ func (avl *Tree) Put(value interface{}) {
 			fsize := getSize(fixed)
 			if fsize == 3 {
 				lefts, rigths := getChildrenSize(fixed)
-				avl.fixPutHeight(fixed, lefts, rigths)
+				avl.fix3PutHeight(fixed, lefts, rigths)
 			}
 			return
 		}
 
 		if cur.size > 9 {
 			ls, rs := cur.children[0].size, cur.children[1].size
-			if rs >= ls*2 || ls >= rs*2 {
+			factor := cur.size / 10 // or factor = 1
+			if rs >= ls*2+factor || ls >= rs*2+factor {
 				avl.fixPutHeight(cur, ls, rs)
 			}
 		}
@@ -499,6 +500,29 @@ func (avl *Tree) Traversal(every func(v interface{}) bool, traversalMethod ...in
 	}
 }
 
+func (avl *Tree) lrrotate3(cur *Node) {
+	const l = 1
+	const r = 0
+
+	movparent := cur.children[l]
+	mov := movparent.children[r]
+
+	mov.value, cur.value = cur.value, mov.value //交换值达到, 相对位移
+
+	cur.children[r] = mov
+	mov.parent = cur
+
+	cur.children[l] = movparent
+	movparent.children[r] = nil
+
+	cur.children[r] = mov
+	mov.parent = cur
+
+	// cur.size = 3
+	// cur.children[r].size = 1
+	cur.children[l].size = 1
+}
+
 func (avl *Tree) lrrotate(cur *Node) {
 
 	const l = 1
@@ -547,6 +571,29 @@ func (avl *Tree) lrrotate(cur *Node) {
 	// cur.height = getMaxChildrenHeight(cur) + 1
 }
 
+func (avl *Tree) rlrotate3(cur *Node) {
+	const l = 0
+	const r = 1
+
+	movparent := cur.children[l]
+	mov := movparent.children[r]
+
+	mov.value, cur.value = cur.value, mov.value //交换值达到, 相对位移
+
+	cur.children[r] = mov
+	mov.parent = cur
+
+	cur.children[l] = movparent
+	movparent.children[r] = nil
+
+	cur.children[r] = mov
+	mov.parent = cur
+
+	// cur.size = 3
+	// cur.children[r].size = 1
+	cur.children[l].size = 1
+}
+
 func (avl *Tree) rlrotate(cur *Node) {
 
 	const l = 0
@@ -585,6 +632,25 @@ func (avl *Tree) rlrotate(cur *Node) {
 	cur.size = getChildrenSumSize(cur) + 1
 }
 
+func (avl *Tree) rrotate3(cur *Node) {
+	const l = 0
+	const r = 1
+	// 1 right 0 left
+	mov := cur.children[l]
+
+	mov.value, cur.value = cur.value, mov.value //交换值达到, 相对位移
+
+	cur.children[r] = mov
+	mov.size = 1
+
+	cur.children[l] = mov.children[l]
+	cur.children[l].parent = cur
+
+	mov.children[l] = nil
+
+	mov.size = 1
+}
+
 func (avl *Tree) rrotate(cur *Node) {
 
 	const l = 0
@@ -628,6 +694,25 @@ func (avl *Tree) rrotate(cur *Node) {
 	// cur.height = getMaxChildrenHeight(cur) + 1
 }
 
+func (avl *Tree) lrotate3(cur *Node) {
+	const l = 1
+	const r = 0
+	// 1 right 0 left
+	mov := cur.children[l]
+
+	mov.value, cur.value = cur.value, mov.value //交换值达到, 相对位移
+
+	cur.children[r] = mov
+	mov.size = 1
+
+	cur.children[l] = mov.children[l]
+	cur.children[l].parent = cur
+
+	mov.children[l] = nil
+
+	mov.size = 1
+}
+
 func (avl *Tree) lrotate(cur *Node) {
 
 	const l = 1
@@ -698,6 +783,26 @@ func (avl *Tree) fixRemoveHeight(cur *Node) {
 	}
 }
 
+func (avl *Tree) fix3PutHeight(cur *Node, lefts, rigths int) {
+	if lefts > rigths {
+		l := cur.children[0]
+		llsize, lrsize := getChildrenSize(l)
+		if lrsize > llsize {
+			avl.rlrotate3(cur)
+		} else {
+			avl.rrotate3(cur)
+		}
+	} else {
+		r := cur.children[1]
+		rlsize, rrsize := getChildrenSize(r)
+		if rlsize > rrsize {
+			avl.lrrotate3(cur)
+		} else {
+			avl.lrotate3(cur)
+		}
+	}
+}
+
 func (avl *Tree) fixPutHeight(cur *Node, lefts, rigths int) {
 	if lefts > rigths {
 		l := cur.children[0]
diff --git a/avlindex/avlindex_test.go b/avlindex/avlindex_test.go
index 8fa7df6..3235ed3 100644
--- a/avlindex/avlindex_test.go
+++ b/avlindex/avlindex_test.go
@@ -8,6 +8,8 @@ import (
 	"os"
 	"testing"
 
+	"github.com/huandu/skiplist"
+
 	"github.com/Pallinder/go-randomdata"
 	"github.com/davecgh/go-spew/spew"
 	"github.com/emirpasic/gods/trees/avltree"
@@ -15,7 +17,7 @@ import (
 	"github.com/emirpasic/gods/utils"
 )
 
-const CompartorSize = 100000
+const CompartorSize = 1000000
 const NumberMax = 50000000
 
 func TestSave(t *testing.T) {
@@ -69,6 +71,7 @@ func TestIterator(t *testing.T) {
 	// }
 	// t.Error(avl.Values())
 	// t.Error(avl.debugString())
+
 }
 
 func TestGetRange(t *testing.T) {
@@ -305,6 +308,70 @@ ALL:
 	}
 }
 
+func BenchmarkSkipListGet(b *testing.B) {
+	sl := skiplist.New(skiplist.Int)
+	l := loadTestData()
+	b.N = len(l)
+
+	for _, v := range l {
+		sl.Set(v, v)
+	}
+
+	b.ResetTimer()
+	b.StartTimer()
+
+	execCount := 5
+	b.N = len(l) * execCount
+
+	for i := 0; i < execCount; i++ {
+		for _, v := range l {
+			e := sl.Get(v)
+			var result [50]interface{}
+			for i := 0; i < 50 && e != nil; i++ {
+				result[i] = e.Value
+				e = e.Next()
+			}
+		}
+	}
+}
+
+func BenchmarkGetRange(b *testing.B) {
+	tree := New(utils.IntComparator)
+	l := loadTestData()
+	b.N = len(l)
+
+	for _, v := range l {
+		tree.Put(v)
+	}
+
+	b.ResetTimer()
+	b.StartTimer()
+
+	execCount := 5
+	b.N = len(l) * execCount
+
+	for i := 0; i < execCount; i++ {
+		for range l {
+			tree.GetRange(i, i+49)
+		}
+	}
+}
+
+func BenchmarkSkipListSet(b *testing.B) {
+	sl := skiplist.New(skiplist.Int)
+	l := loadTestData()
+
+	execCount := 50
+	b.N = len(l) * execCount
+
+	for i := 0; i < execCount; i++ {
+		for _, v := range l {
+			sl.Set(v, v)
+		}
+	}
+
+}
+
 func BenchmarkIterator(b *testing.B) {
 	tree := New(utils.IntComparator)
 
@@ -458,7 +525,7 @@ func BenchmarkPut(b *testing.B) {
 	b.ResetTimer()
 	b.StartTimer()
 
-	execCount := 500
+	execCount := 50
 	b.N = len(l) * execCount
 	for i := 0; i < execCount; i++ {
 		avl := New(utils.IntComparator)