diff --git a/src/exercise-22/matrix_mul.c b/src/exercise-22/matrix_mul.c
index 0752395ce7d9d15499ee37c49401d98b8fb86ccb..cacfb6e9eee482a28b830e7e6658addb9e15050c 100644
--- a/src/exercise-22/matrix_mul.c
+++ b/src/exercise-22/matrix_mul.c
@@ -18,7 +18,14 @@ multiply (int **A, int ASize, int *AColSize, int **B, int BSize, int *BColSize,
     }
 
   // 下面通过多重循环实现两个矩阵相乘
-
+      for (int i = 0; i < ASize; i++) {  
+        for (int j = 0; j < BCo1Size[0]; j++) {  
+            for (int k = 0; k < ACo1Size[0]; k++) {  
+                result[i][j] += A[i][k] * B[k][j];  
+            }  
+        }  
+    }  
+    
   *returnSize = ASize;
   return result;
 }