diff --git a/problems/0704.二分查找.md b/problems/0704.二分查找.md
index 55625130..9173d1da 100644
--- a/problems/0704.二分查找.md
+++ b/problems/0704.二分查找.md
@@ -611,6 +611,38 @@ public class Solution{
 }
 ```
 
+**Kotlin:**
+```Kotlin
+// （版本一）左闭右开区间
+class Solution {
+    fun search(nums: IntArray, target: Int): Int {
+        var left = 0
+        var right = nums.size // [left,right) 右侧为开区间，right 设置为 nums.size
+        while (left < right) {
+            val mid = (left + right) / 2
+            if (nums[mid] < target) left = mid + 1
+            else if (nums[mid] > target) right = mid // 代码的核心，循环中 right 是开区间，这里也应是开区间
+            else return mid
+        }
+        return -1 // 没有找到 target ，返回 -1
+    }
+}
+// （版本二）左闭右闭区间
+class Solution {
+    fun search(nums: IntArray, target: Int): Int {
+        var left = 0
+        var right = nums.size - 1 // [left,right] 右侧为闭区间，right 设置为 nums.size - 1
+        while (left <= right) {
+            val mid = (left + right) / 2
+            if (nums[mid] < target) left = mid + 1
+            else if (nums[mid] > target) right = mid - 1 // 代码的核心，循环中 right 是闭区间，这里也应是闭区间
+            else return mid
+        }
+        return -1 // 没有找到 target ，返回 -1
+    }
+}
+```
+
 
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 <div align="center"><img src=https://code-thinking.cdn.bcebos.com/pics/01二维码一.jpg width=500> </img></div>