diff --git a/sudoku2.c b/sudoku2.c
new file mode 100644
index 0000000..78dd5cc
--- /dev/null
+++ b/sudoku2.c
@@ -0,0 +1,66 @@
+/*-------------------*/
+/*实验：数独矩阵------*/
+/*2.随机生成一个 9×9 的不完整的矩阵；*/
+/*-------------------*/
+#include<stdio.h>
+#include<stdlib.h>
+#include<time.h>
+void randseedInit(){
+    srand(time(NULL));
+}
+void makeNSeq(int _seq[],int n){//产生1-n的不重复序列（传入一个数组名指针）
+    int ct[9] = {0, 0, 0, 0, 0, 0, 0, 0, 0};
+    int i; 
+    for (i = 0; i < n; i++) {
+        int t = rand() % n;
+        while(ct[t=rand() % n]);
+        ct[t]++;
+        _seq[i] = t+1;
+    }
+}
+void initBoard(int _board[9][9]){
+	int i,j;
+    for (i = 0; i < 9;i++)
+        for ( j = 0; j < 9;j++)
+            _board[i][j] = 0;
+}
+void makeRandomBoard(int _board[9][9]){
+    initBoard(_board);
+    int i_1;
+    for (i_1 = 0; i_1 < 3;i_1++){
+        int seq[9];
+        makeNSeq(seq, 9);
+        int i;
+        for ( i = 0; i < 3;i++){
+            int where[9];
+            makeNSeq(where, 9);
+            int idx;
+            for ( idx = 0; idx < 3;idx++){
+                _board[i_1 * 3 + i][where[idx+i*3]-1] = seq[idx+i*3];
+            }
+        }
+    }
+}
+void printBoad(int _board[9][9]){
+	int i;
+    for ( i = 0; i < 9;i++){
+        if(!(i%3))printf("|-----------------------|\n");
+        int j;
+        for ( j = 0; j < 9;j++){
+            if(!(j%3))
+                printf("| ");
+            if(_board[i][j]==0)
+                printf(". ");
+            else 
+                printf("%d ", _board[i][j]);
+        }
+        printf("|\n");
+    }
+    printf("|-----------------------|\n");
+}
+int main(){
+    randseedInit();
+    int board[9][9];
+    makeRandomBoard(board);
+    printBoad(board);
+}