diff --git a/tree/avl/avl.go b/tree/avl/avl.go
index 4fe37bd..56fadcc 100644
--- a/tree/avl/avl.go
+++ b/tree/avl/avl.go
@@ -1,8 +1,10 @@
 package avl
 
 import (
-	"github.com/474420502/focus/compare"
 	"github.com/davecgh/go-spew/spew"
+
+	"github.com/474420502/focus/compare"
+	"github.com/474420502/focus/tree"
 )
 
 type Node struct {
@@ -31,6 +33,10 @@ type Tree struct {
 	iter    *Iterator
 }
 
+func assertImplementation() {
+	var _ tree.IBSTree = (*Tree)(nil)
+}
+
 func New(Compare compare.Compare) *Tree {
 	return &Tree{Compare: Compare, iter: NewIteratorWithCap(nil, 16)}
 }
diff --git a/tree/avldup/avldup.go b/tree/avldup/avldup.go
index 5c5203a..e913a6d 100644
--- a/tree/avldup/avldup.go
+++ b/tree/avldup/avldup.go
@@ -1,8 +1,10 @@
 package avldup
 
 import (
-	"github.com/474420502/focus/compare"
 	"github.com/davecgh/go-spew/spew"
+
+	"github.com/474420502/focus/compare"
+	"github.com/474420502/focus/tree"
 )
 
 type Node struct {
@@ -32,6 +34,10 @@ type Tree struct {
 	iter *Iterator
 }
 
+func assertImplementation() {
+	var _ tree.IBSTree = (*Tree)(nil)
+}
+
 func New(Compare compare.Compare) *Tree {
 	return &Tree{Compare: Compare, iter: NewIteratorWithCap(nil, 16)}
 }
diff --git a/tree/avlkey/avlkey.go b/tree/avlkey/avlkey.go
index c4dd2f4..a6f164b 100644
--- a/tree/avlkey/avlkey.go
+++ b/tree/avlkey/avlkey.go
@@ -1,8 +1,10 @@
 package avlkey
 
 import (
-	"github.com/474420502/focus/compare"
 	"github.com/davecgh/go-spew/spew"
+
+	"github.com/474420502/focus/compare"
+	"github.com/474420502/focus/tree"
 )
 
 type Node struct {
@@ -35,6 +37,10 @@ func New(Compare compare.Compare) *Tree {
 	return &Tree{Compare: Compare, iter: NewIteratorWithCap(nil, 16)}
 }
 
+func assertImplementation() {
+	var _ tree.IBSTreeKey = (*Tree)(nil)
+}
+
 func (tree *Tree) String() string {
 	if tree.size == 0 {
 		return ""
diff --git a/tree/avlkeydup/avlkeydup.go b/tree/avlkeydup/avlkeydup.go
index d7bd156..ddd2dbc 100644
--- a/tree/avlkeydup/avlkeydup.go
+++ b/tree/avlkeydup/avlkeydup.go
@@ -1,8 +1,10 @@
 package avlkeydup
 
 import (
-	"github.com/474420502/focus/compare"
 	"github.com/davecgh/go-spew/spew"
+
+	"github.com/474420502/focus/compare"
+	"github.com/474420502/focus/tree"
 )
 
 type Node struct {
@@ -31,6 +33,10 @@ type Tree struct {
 	iter    *Iterator
 }
 
+func assertImplementation() {
+	var _ tree.IBSTreeKey = (*Tree)(nil)
+}
+
 func New(Compare compare.Compare) *Tree {
 	return &Tree{Compare: Compare, iter: NewIteratorWithCap(nil, 16)}
 }
diff --git a/heap/heap.go b/tree/heap/heap.go
similarity index 98%
rename from heap/heap.go
rename to tree/heap/heap.go
index b6564cd..b574056 100644
--- a/heap/heap.go
+++ b/tree/heap/heap.go
@@ -54,7 +54,7 @@ func (h *Heap) Top() (interface{}, bool) {
 	return nil, false
 }
 
-func (h *Heap) Push(v interface{}) {
+func (h *Heap) Put(v interface{}) {
 	if v == nil {
 		return
 	}
diff --git a/heap/heap_test.go b/tree/heap/heap_test.go
similarity index 99%
rename from heap/heap_test.go
rename to tree/heap/heap_test.go
index bb9cb66..5d085df 100644
--- a/heap/heap_test.go
+++ b/tree/heap/heap_test.go
@@ -11,7 +11,7 @@ func TestHeapPushTopPop(t *testing.T) {
 	l := []int{9, 5, 15, 2, 3}
 	ol := []int{15, 9, 5, 3, 2}
 	for _, v := range l {
-		h.Push(v)
+		h.Put(v)
 	}
 
 	for _, tv := range ol {
diff --git a/tree/tree.go b/tree/tree.go
new file mode 100644
index 0000000..6fd8c2c
--- /dev/null
+++ b/tree/tree.go
@@ -0,0 +1,27 @@
+package tree
+
+// IBSTreeKey Compare函数可以自定义所以key不一定value, 可以是value结构体中一个属性
+type IBSTreeKey interface {
+	String() string
+	Size() int
+	Remove(key interface{}) (interface{}, bool)
+	Clear()
+	// Values 返回先序遍历的值
+	Values() []interface{}
+	Get(key interface{}) (interface{}, bool)
+	Put(key, value interface{})
+	Traversal(every func(k, v interface{}) bool, traversalMethod ...interface{})
+}
+
+// IBSTree
+type IBSTree interface {
+	String() string
+	Size() int
+	Remove(key interface{}) (interface{}, bool)
+	Clear()
+	// Values 返回先序遍历的值
+	Values() []interface{}
+	Get(key interface{}) (interface{}, bool)
+	Put(value interface{})
+	Traversal(every func(v interface{}) bool, traversalMethod ...interface{})
+}
diff --git a/tree/vbt/vbt.go b/tree/vbt/vbt.go
index a703bd7..3532cb5 100644
--- a/tree/vbt/vbt.go
+++ b/tree/vbt/vbt.go
@@ -1,8 +1,10 @@
 package vbt
 
 import (
-	"github.com/474420502/focus/compare"
 	"github.com/davecgh/go-spew/spew"
+
+	"github.com/474420502/focus/compare"
+	"github.com/474420502/focus/tree"
 )
 
 type Node struct {
@@ -31,6 +33,10 @@ type Tree struct {
 	iter *Iterator
 }
 
+func assertImplementation() {
+	var _ tree.IBSTree = (*Tree)(nil)
+}
+
 func New(Compare compare.Compare) *Tree {
 	return &Tree{Compare: Compare, iter: NewIteratorWithCap(nil, 16)}
 }
@@ -231,6 +237,11 @@ func (tree *Tree) Remove(key interface{}) (interface{}, bool) {
 	return nil, false
 }
 
+func (tree *Tree) Clear() {
+	tree.root = nil
+	tree.iter = NewIteratorWithCap(nil, 16)
+}
+
 // Values 返回先序遍历的值
 func (tree *Tree) Values() []interface{} {
 	mszie := 0
diff --git a/tree/vbtkey/vbtkey.go b/tree/vbtkey/vbtkey.go
index 580b73e..a85d699 100644
--- a/tree/vbtkey/vbtkey.go
+++ b/tree/vbtkey/vbtkey.go
@@ -1,8 +1,10 @@
 package vbtkey
 
 import (
-	"github.com/474420502/focus/compare"
 	"github.com/davecgh/go-spew/spew"
+
+	"github.com/474420502/focus/compare"
+	"github.com/474420502/focus/tree"
 )
 
 type Node struct {
@@ -32,6 +34,10 @@ type Tree struct {
 	iter *Iterator
 }
 
+func assertImplementation() {
+	var _ tree.IBSTreeKey = (*Tree)(nil)
+}
+
 func New(Compare compare.Compare) *Tree {
 	return &Tree{Compare: Compare, iter: NewIteratorWithCap(nil, 16)}
 }
@@ -232,6 +238,11 @@ func (tree *Tree) Remove(key interface{}) (interface{}, bool) {
 	return nil, false
 }
 
+func (tree *Tree) Clear() {
+	tree.root = nil
+	tree.iter = NewIteratorWithCap(nil, 16)
+}
+
 // Values 返回先序遍历的值
 func (tree *Tree) Values() []interface{} {
 	mszie := 0
@@ -239,7 +250,7 @@ func (tree *Tree) Values() []interface{} {
 		mszie = tree.root.size
 	}
 	result := make([]interface{}, 0, mszie)
-	tree.Traversal(func(v interface{}) bool {
+	tree.Traversal(func(k, v interface{}) bool {
 		result = append(result, v)
 		return true
 	}, LDR)
@@ -500,8 +511,8 @@ const (
 	RLD
 )
 
-// Traversal 遍历的方法 默认是LDR 从小到大 comparator 为 l < r
-func (tree *Tree) Traversal(every func(v interface{}) bool, traversalMethod ...interface{}) {
+// Traversal 遍历的方法 默认是LDR 从小到大 Compare 为 l < r
+func (tree *Tree) Traversal(every func(k, v interface{}) bool, traversalMethod ...interface{}) {
 	if tree.root == nil {
 		return
 	}
@@ -518,7 +529,7 @@ func (tree *Tree) Traversal(every func(v interface{}) bool, traversalMethod ...i
 			if cur == nil {
 				return true
 			}
-			if !every(cur.value) {
+			if !every(cur.key, cur.value) {
 				return false
 			}
 			if !traverasl(cur.children[0]) {
@@ -539,7 +550,7 @@ func (tree *Tree) Traversal(every func(v interface{}) bool, traversalMethod ...i
 			if !traverasl(cur.children[0]) {
 				return false
 			}
-			if !every(cur.value) {
+			if !every(cur.key, cur.value) {
 				return false
 			}
 			if !traverasl(cur.children[1]) {
@@ -560,7 +571,7 @@ func (tree *Tree) Traversal(every func(v interface{}) bool, traversalMethod ...i
 			if !traverasl(cur.children[1]) {
 				return false
 			}
-			if !every(cur.value) {
+			if !every(cur.key, cur.value) {
 				return false
 			}
 			return true
@@ -572,7 +583,7 @@ func (tree *Tree) Traversal(every func(v interface{}) bool, traversalMethod ...i
 			if cur == nil {
 				return true
 			}
-			if !every(cur.value) {
+			if !every(cur.key, cur.value) {
 				return false
 			}
 			if !traverasl(cur.children[0]) {
@@ -593,7 +604,7 @@ func (tree *Tree) Traversal(every func(v interface{}) bool, traversalMethod ...i
 			if !traverasl(cur.children[1]) {
 				return false
 			}
-			if !every(cur.value) {
+			if !every(cur.key, cur.value) {
 				return false
 			}
 			if !traverasl(cur.children[0]) {
@@ -614,7 +625,7 @@ func (tree *Tree) Traversal(every func(v interface{}) bool, traversalMethod ...i
 			if !traverasl(cur.children[0]) {
 				return false
 			}
-			if !every(cur.value) {
+			if !every(cur.key, cur.value) {
 				return false
 			}
 			return true
diff --git a/tree/vbtkey/vbtkey_test.go b/tree/vbtkey/vbtkey_test.go
index 1ea0c4b..9b5f2af 100644
--- a/tree/vbtkey/vbtkey_test.go
+++ b/tree/vbtkey/vbtkey_test.go
@@ -7,9 +7,9 @@ import (
 	"log"
 	"testing"
 
-	"github.com/474420502/focus/compare"
-
 	"github.com/davecgh/go-spew/spew"
+
+	"github.com/474420502/focus/compare"
 )
 
 func loadTestData() []int {
@@ -265,8 +265,8 @@ func TestTravalsal(t *testing.T) {
 
 	i := 0
 	var result []interface{}
-	tree.Traversal(func(v interface{}) bool {
-		result = append(result, v)
+	tree.Traversal(func(k, v interface{}) bool {
+		result = append(result, k)
 		i++
 		if i >= 10 {
 			return false