diff --git a/sort/shell-sort.mjs b/sort/shell-sort.mjs
index 12e6a52..21b12ae 100644
--- a/sort/shell-sort.mjs
+++ b/sort/shell-sort.mjs
@@ -69,3 +69,25 @@ export function shellSort2(arr) {
         gap = Math.floor(gap / 2)
     }  
 }
+
+/**
+ * 优化版本
+ * @param {number[]} arr 
+ */
+export function shellSort3(arr){
+    const n = arr.length
+    let gap = Math.floor(n/2)
+    while (gap>0){ // 使用不同的gap对子数组排序
+        for(let i = gap; i<n;i++){
+            // 插入过程
+            let temp = arr[i]
+            let j = i
+            while(j>0 && arr[j-gap] > temp) {
+                arr[j] = arr[j-gap]
+                j-=gap
+            }
+            arr[j] = temp
+        }
+        gap = Math.floor(gap/2)
+    }
+}