diff --git a/Chen/CHEN_5.c b/Chen/CHEN_5.c
new file mode 100644
index 0000000..c5f99a5
--- /dev/null
+++ b/Chen/CHEN_5.c
@@ -0,0 +1,70 @@
+#include <stdio.h>
+#include <time.h>
+#include <stdlib.h>
+#define SIZE 1024
+
+void sparce_matmul_coo(float*, int*, int*, int,
+	float*, int*, int*, int, float*, int*, int*, int*);
+int main() {
+	// 矩阵 A 的 COO 格式
+	float A_values[] = {1, 2, 3, 4, 5}; 
+	int A_rowIndex[] = {0, 0, 1, 2, 2}; 
+	int A_colIndex[] = {0, 2, 1, 0, 2}; 
+	int A_nonZeroCount = 5;
+	// 矩阵 B 的 Coo 格式
+	float B_values[] = {6, 8, 7, 9}; 
+	int B_rowIndex[] = {0, 2, 1, 2}; 
+	int B_colIndex[] = {0, 0, 1, 2}; 
+	int B_nonZeroCount = 4;// 结果矩阵 C 的 Coo 格式
+	float C_values[SIZE]; 
+	int C_rowIndex[SIZE]; 
+	int C_colIndex[SIZE]; 
+	int C_nonZeroCount = 0;
+
+	clock_t start = clock();
+	sparce_matmul_coo(A_values, A_rowIndex, A_colIndex, A_nonZeroCount,
+	                  B_values, B_rowIndex, B_colIndex, B_nonZeroCount,
+					  C_values, C_rowIndex, C_colIndex, &C_nonZeroCount);
+	clock_t end = clock();
+	printf("基础的稀疏矩阵乘法时间：%lf\n", (double)(end-start) / CLOCKS_PER_SEC);
+}
+
+void sparce_matmul_coo(float* A_values, int* A_rowIndex, int* A_colIndex, int A_nonZeroCount,
+                       float* B_values, int* B_rowIndex, int* B_colIndex, int B_nonZeroCount,
+					   float* C_values, int* C_rowIndex, int* C_colIndex, int* C_nonZeroCount) {
+    int currentIndex = 0;
+	int i, j, k;
+	int rowA, colA, rowB, colB;
+	float valueA, valueB, product;
+	// 遍历 A 的非零元素
+	for(i=0; i<A_nonZeroCount; i++) {
+		rowA = A_rowIndex[i];
+		colA = A_colIndex[i];
+		valueA = A_values[i];
+		// 遍历 B 的非零元素
+		for(j=0; j<B_nonZeroCount; j++) {
+			rowB = B_rowIndex[j];
+			colB = B_colIndex[j];
+			valueB = B_values[j];
+			// 如果 A 的列和 B 的行匹配，则计算乘积并存储结果
+			if (colA == rowB) {
+				product = valueA * valueB;
+				// 检查是否已有此(rowA, colB) 项
+				int found = 0;
+				for(k=0; k<currentIndex; k++) {
+					if(C_rowIndex[k] == rowA && C_colIndex[k] == colB) {
+						C_values[k] += product;
+						break;
+					}
+				}
+				if (!found) {
+					C_values[currentIndex] = product;
+					C_rowIndex[currentIndex] = rowA;
+					C_colIndex[currentIndex] = colB;
+					currentIndex++;
+				}
+			}
+		}
+	}
+	*C_nonZeroCount = currentIndex;
+}
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