diff --git a/README.md b/README.md
index ba51d5f..ed825d9 100644
--- a/README.md
+++ b/README.md
@@ -5,18 +5,47 @@
 ## PriorityQueue
 
 ``` golang
-pq := pqueuekey.New(compare.Int)
-pq.Push(1, 1)
-pq.Push(4, 4)
-pq.Push(5, 5)
-pq.Push(6, 6)
-pq.Push(2, 2)        // pq.Values() = [6 5 4 2 1]
-value, _ := pq.Pop() // value = 6
-value, _ = pq.Get(1)        // value = 1 pq.Values() = [5 4 2 1]
-value, _ = pq.Get(0)        // value = nil , Get equal to Seach Key
-value, _ = pq.Index(0)      // value = 5, compare.Int the order from big to small
-values := pq.GetRange(2, 5) // values = [2 4 5]
-values = pq.GetRange(5, 2)  // values = [5 4 2]
-values = pq.GetRange(100, 2) // values = [5 4 2]
-values3 := pq.GetAround(5) //  values3 = [<nil>, 5, 4]
+package main
+
+import (
+    "log"
+
+    "github.com/474420502/focus/compare"
+    pqueuekey "github.com/474420502/focus/priority_queuekey"
+)
+
+func main() {
+    pq := pqueuekey.New(compare.Int)
+    pq.Push(1, 1)
+    pq.Push(4, 4)
+    pq.Push(5, 5)
+    pq.Push(6, 6)
+    pq.Push(2, 2) // pq.Values() = [6 5 4 2 1]
+    log.Println(pq.Values())
+    value, _ := pq.Pop() // value = 6
+    log.Println(value)
+    value, _ = pq.Get(1) // value = 1 pq.Values() = [5 4 2 1]
+    log.Println(value)
+    value, _ = pq.Get(0) // value = nil , Get equal to Seach Key
+    log.Println(value)
+    value, _ = pq.Index(0) // value = 5, compare.Int the order from big to small
+    log.Println(value)
+    values := pq.GetRange(2, 5) // values = [2 4 5]
+    log.Println(values)
+    values = pq.GetRange(5, 2) // values = [5 4 2]
+    log.Println(values)
+    values = pq.GetRange(100, 2) // values = [5 4 2]
+    log.Println(values)
+    values3 := pq.GetAround(5) // values3 = [<nil>, 5, 4]
+    log.Println(values3)
+
+    iter := pq.Iterator() // Next 小到大
+    // log.Println(iter.Value()) 直接使用会报错,
+    iter.Next()
+    log.Println(iter.Value()) // 起始最大值 5
+
+    log.Println(iter.Next(), iter.Value()) // 5
+    // 大到小
+    log.Println(iter.Prev(), iter.Value()) // 4
+}
 ```