diff --git a/priority_queue/vbt.go b/priority_queue/vbt.go
index 1f584a2..f3c7ea5 100644
--- a/priority_queue/vbt.go
+++ b/priority_queue/vbt.go
@@ -170,6 +170,7 @@ func (tree *vbTree) removeNode(n *tNode) {
 	if ls == 0 && rs == 0 {
 		p := n.parent
 		p.children[getRelationship(n)] = nil
+		// p.size -= n.size
 		tree.fixSizeWithRemove(p)
 		// return n
 		return
@@ -196,17 +197,18 @@ func (tree *vbTree) removeNode(n *tNode) {
 
 		cright := cur.children[1]
 		cur.parent.children[getRelationship(cur)] = cright
-
 		if cright != nil {
 			cright.parent = cur.parent
 		}
 	}
 
 	cparent := cur.parent
-	replaceNodeMayRoot(n, cur)
+	if cparent == n {
+		cparent = cur
+	}
+	tree.replaceNodeMayRoot(n, cur)
 	// 修改为interface 交换
 	// n.value, cur.value = cur.value, n.value
-
 	tree.fixSizeWithRemove(cparent)
 	return
 }
@@ -964,16 +966,11 @@ func replaceNodeNotRoot(oldn, newn *tNode) {
 	}
 }
 
-func replaceNodeMayRoot(oldn, newn *tNode) {
-	if newn.parent == oldn {
-		if oldn.children[0] == newn {
-			oldn.children[0] = nil
-		} else {
-			oldn.children[1] = nil
-		}
-	}
+func (tree *vbTree) replaceNodeMayRoot(oldn, newn *tNode) {
+
 	newn.children[0] = oldn.children[0]
 	newn.children[1] = oldn.children[1]
+	newn.size = oldn.size
 	newn.parent = oldn.parent
 	if oldn.parent != nil {
 		if oldn.parent.children[0] == oldn {
@@ -981,10 +978,12 @@ func replaceNodeMayRoot(oldn, newn *tNode) {
 		} else {
 			oldn.parent.children[1] = newn
 		}
+	} else {
+		tree.root = newn
 	}
 }
 
-func tailReplaceNode(oldn, newn *tNode) {
+func (tree *vbTree) tailReplaceNode(oldn, newn *tNode) {
 	newn.children[0] = oldn.children[0]
 	newn.children[1] = oldn.children[1]
 	newn.parent = oldn.parent
@@ -994,6 +993,8 @@ func tailReplaceNode(oldn, newn *tNode) {
 		} else {
 			oldn.parent.children[1] = newn
 		}
+	} else {
+		tree.root = newn
 	}
 }
 
@@ -1052,7 +1053,7 @@ func outputfordebug(node *tNode, prefix string, isTail bool, str *string) {
 	if node.parent == nil {
 		parentv = "nil"
 	} else {
-		parentv = spew.Sprint(node.value)
+		parentv = spew.Sprint(node.parent.value)
 	}
 	suffix += parentv + "|" + spew.Sprint(node.size) + ")"
 	*str += spew.Sprint(node.value) + suffix + "\n"
diff --git a/priority_queue/vbt_test.go b/priority_queue/vbt_test.go
index 821fb47..8a0604a 100644
--- a/priority_queue/vbt_test.go
+++ b/priority_queue/vbt_test.go
@@ -335,8 +335,8 @@ ALL:
 		var l []int
 		m := make(map[int]int)
 
-		for i := 0; len(l) < 20; i++ {
-			v := randomdata.Number(0, 100000)
+		for i := 0; len(l) < 10; i++ {
+			v := randomdata.Number(0, 100)
 			if _, ok := m[v]; !ok {
 				m[v] = v
 				l = append(l, v)
@@ -345,18 +345,23 @@ ALL:
 			}
 		}
 
-		for i := 0; i < 20; i++ {
-
+		for i := 0; i < 10; i++ {
+			beforce := tree.debugString()
 			tree.Remove(l[i])
+			after := tree.debugString()
 			gods.Remove(l[i])
 
+			t.Error(beforce)
+			t.Error(after, l[i])
 			s1 := spew.Sprint(tree.Values())
 			s2 := spew.Sprint(gods.Values())
 			if s1 != s2 {
-				t.Error("avl remove error", "avlsize = ", tree.Size())
-				t.Error(tree.root, i, l[i])
-				t.Error(s1)
-				t.Error(s2)
+				// t.Error("avl remove error", "avlsize = ", tree.Size())
+				// t.Error(beforce)
+				// t.Error(after)
+				// t.Error(tree.root, i, l[i])
+				// t.Error(s1)
+				// t.Error(s2)
 				break ALL
 			}
 		}
diff --git a/vbt/vbt.go b/vbt/vbt.go
index 44fc835..1f9e034 100644
--- a/vbt/vbt.go
+++ b/vbt/vbt.go
@@ -955,7 +955,7 @@ func outputfordebug(node *Node, prefix string, isTail bool, str *string) {
 	if node.parent == nil {
 		parentv = "nil"
 	} else {
-		parentv = spew.Sprint(node.value)
+		parentv = spew.Sprint(node.parent.value)
 	}
 	suffix += parentv + "|" + spew.Sprint(node.size) + ")"
 	*str += spew.Sprint(node.value) + suffix + "\n"
diff --git a/vbtkey/vbtkey.go b/vbtkey/vbtkey.go
index 0559f14..fd0c549 100644
--- a/vbtkey/vbtkey.go
+++ b/vbtkey/vbtkey.go
@@ -956,7 +956,7 @@ func outputfordebug(node *Node, prefix string, isTail bool, str *string) {
 	if node.parent == nil {
 		parentv = "nil"
 	} else {
-		parentv = spew.Sprint(node.key) + ":" + spew.Sprint(node.value)
+		parentv = spew.Sprint(node.key) + ":" + spew.Sprint(node.parent.value)
 	}
 	suffix += parentv + "|" + spew.Sprint(node.size) + ")"
 	*str += spew.Sprint(node.key) + ":" + spew.Sprint(node.value) + suffix + "\n"