diff --git a/Algorithms/217. Contains Duplicate/217. Contains Duplicate.go b/Algorithms/217. Contains Duplicate/217. Contains Duplicate.go
new file mode 100644
index 00000000..d6b82e82
--- /dev/null
+++ b/Algorithms/217. Contains Duplicate/217. Contains Duplicate.go	
@@ -0,0 +1,12 @@
+package leetcode
+
+func containsDuplicate(nums []int) bool {
+	record := make(map[int]bool, len(nums))
+	for _, n := range nums {
+		if _, found := record[n]; found {
+			return true
+		}
+		record[n] = true
+	}
+	return false
+}
diff --git a/Algorithms/217. Contains Duplicate/217. Contains Duplicate_test.go b/Algorithms/217. Contains Duplicate/217. Contains Duplicate_test.go
new file mode 100644
index 00000000..270d0041
--- /dev/null
+++ b/Algorithms/217. Contains Duplicate/217. Contains Duplicate_test.go	
@@ -0,0 +1,52 @@
+package leetcode
+
+import (
+	"fmt"
+	"testing"
+)
+
+type question217 struct {
+	para217
+	ans217
+}
+
+// para 是参数
+// one 代表第一个参数
+type para217 struct {
+	one []int
+}
+
+// ans 是答案
+// one 代表第一个答案
+type ans217 struct {
+	one bool
+}
+
+func Test_Problem217(t *testing.T) {
+
+	qs := []question217{
+
+		question217{
+			para217{[]int{1, 2, 3, 1}},
+			ans217{true},
+		},
+
+		question217{
+			para217{[]int{1, 2, 3, 4}},
+			ans217{false},
+		},
+
+		question217{
+			para217{[]int{1, 1, 1, 3, 3, 4, 3, 2, 4, 2}},
+			ans217{true},
+		},
+	}
+
+	fmt.Printf("------------------------Leetcode Problem 217------------------------\n")
+
+	for _, q := range qs {
+		_, p := q.ans217, q.para217
+		fmt.Printf("【input】:%v       【output】:%v\n", p, containsDuplicate(p.one))
+	}
+	fmt.Printf("\n\n\n")
+}
diff --git a/Algorithms/217. Contains Duplicate/README.md b/Algorithms/217. Contains Duplicate/README.md
new file mode 100644
index 00000000..ea89b154
--- /dev/null
+++ b/Algorithms/217. Contains Duplicate/README.md	
@@ -0,0 +1,32 @@
+# [217. Contains Duplicate](https://leetcode.com/problems/contains-duplicate/)
+
+## 题目
+
+Given an array of integers, find if the array contains any duplicates.
+
+Your function should return true if any value appears at least twice in the array, and it should return false if every element is distinct.
+
+
+Example 1:
+
+```c
+Input: [1,2,3,1]
+Output: true
+```
+Example 2:
+
+```c
+Input: [1,2,3,4]
+Output: false
+```
+
+Example 3:
+
+```c
+Input: [1,1,1,3,3,4,3,2,4,2]
+Output: true
+```
+
+## 题目大意
+
+这是一道简单题，如果数组里面有重复数字就输出 true，否则输出 flase。用 map 判断即可。