diff --git a/Array2D.hpp b/Array2D.hpp
index 553869d..f546746 100644
--- a/Array2D.hpp
+++ b/Array2D.hpp
@@ -33,7 +33,7 @@ public:
             std::cout << '\n';
         }
     }
-    int *operator[](int i) // 重载[]，允许暴露内部数据
+    int *operator[](int i) const// 重载[]，允许暴露内部数据
     {
         if (i < 0 || i >= row)
             throw std::out_of_range{"数组行下标越界\n"};