diff --git "a/lcof2/\345\211\221\346\214\207 Offer II 069. \345\261\261\345\263\260\346\225\260\347\273\204\347\232\204\351\241\266\351\203\250/README.md" "b/lcof2/\345\211\221\346\214\207 Offer II 069. \345\261\261\345\263\260\346\225\260\347\273\204\347\232\204\351\241\266\351\203\250/README.md"
index 6cb4dd2436f82..692560eca4eb4 100644
--- "a/lcof2/\345\211\221\346\214\207 Offer II 069. \345\261\261\345\263\260\346\225\260\347\273\204\347\232\204\351\241\266\351\203\250/README.md"	
+++ "b/lcof2/\345\211\221\346\214\207 Offer II 069. \345\261\261\345\263\260\346\225\260\347\273\204\347\232\204\351\241\266\351\203\250/README.md"	
@@ -182,6 +182,26 @@ var peakIndexInMountainArray = function (arr) {
 };
 ```
 
+#### Swift
+
+```swift
+class Solution {
+    func peakIndexInMountainArray(_ arr: [Int]) -> Int {
+        var left = 1
+        var right = arr.count - 2
+        while left < right {
+            let mid = (left + right) / 2
+            if arr[mid] > arr[mid + 1] {
+                right = mid
+            } else {
+                left = mid + 1
+            }
+        }
+        return left
+    }
+}
+```
+
 <!-- tabs:end -->
 
 <!-- solution:end -->
diff --git "a/lcof2/\345\211\221\346\214\207 Offer II 069. \345\261\261\345\263\260\346\225\260\347\273\204\347\232\204\351\241\266\351\203\250/Solution.swift" "b/lcof2/\345\211\221\346\214\207 Offer II 069. \345\261\261\345\263\260\346\225\260\347\273\204\347\232\204\351\241\266\351\203\250/Solution.swift"
new file mode 100644
index 0000000000000..2535092cf10dd
--- /dev/null
+++ "b/lcof2/\345\211\221\346\214\207 Offer II 069. \345\261\261\345\263\260\346\225\260\347\273\204\347\232\204\351\241\266\351\203\250/Solution.swift"	
@@ -0,0 +1,16 @@
+class Solution {
+    func peakIndexInMountainArray(_ arr: [Int]) -> Int {
+        var left = 1
+        var right = arr.count - 2
+        while left < right {
+            let mid = (left + right) / 2
+            if arr[mid] > arr[mid + 1] {
+                right = mid
+            } else {
+                left = mid + 1
+            }
+        }
+        return left
+    }
+}
+