diff --git a/src/Add-on/Trim.ts b/src/Add-on/Trim.ts
index 3d46f5fdf..ea5c88ae4 100644
--- a/src/Add-on/Trim.ts
+++ b/src/Add-on/Trim.ts
@@ -64,17 +64,16 @@ export class Command_Trim implements Command
                         {
                             let cuStart = splitCus.shift();
 
+                            let i = 0;
                             //正向遍历
-                            for (let i = 0; i < splitCus.length; i++)
+                            for (; i < splitCus.length; i++)
                             {
                                 if (cuStart.Join(splitCus[i]) != true)
-                                {
-                                    splitCus.splice(0, i);//移除0->(i-1)的元素
                                     break;
-                                }
                             }
+                            splitCus.splice(0, i);//移除0->(i-1)的元素
                             //反向遍历(圆的情况需要反向遍历)
-                            for (let i = splitCus.length; i--;)
+                            for (i = splitCus.length; i--;)
                             {
                                 if (cuStart.Join(arrayLast(splitCus)))
                                     splitCus.pop();