diff --git a/DataStructure/README.md b/DataStructure/README.md
index dd807fd..74e9a6f 100644
--- a/DataStructure/README.md
+++ b/DataStructure/README.md
@@ -13,5 +13,6 @@
 .
 ├── test1  # 实验1
 ├── test2  # 实验2
-└── test3  # 实验3
+├── test3  # 实验3
+└── test4  # 实验3
 ```
diff --git a/DataStructure/test4/实验四.cpp b/DataStructure/test4/实验四.cpp
new file mode 100644
index 0000000..d679348
--- /dev/null
+++ b/DataStructure/test4/实验四.cpp
@@ -0,0 +1,162 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define MAXSIZE 100
+typedef struct Stack
+{
+    char *base;    // Õ»µ×Ö¸Õë
+    char *top;     // Õ»¶¥Ö¸Õë
+    int stacksize; // Õ»¿ÉÓõÄ×î´óÈÝÁ¿
+    int length;    // ÐÂÔö£ºÓÃÀ´ÅжÏÕ»ÊÇ·ñΪ¿Õ
+} Stack;
+
+// ³õʼ»¯
+void InitStack(Stack &p)
+{
+    p.base = new char[MAXSIZE]; // ·ÖÅä¿Õ¼ä
+    // todo list  ´¦Àí Õ»¶¥Ö¸Õëtop³õʼΪbase
+    p.top = p.base;
+    // todo list  ´¦Àístacksize¡¢length
+    p.length = 0;
+    p.stacksize = MAXSIZE - p.length;
+}
+
+#define OK 0
+#define ERROR 0
+typedef int Status;
+// ÈëÕ»
+Status Push(Stack &p, char e)
+{
+    // if(//todo list) // Õ»Âú
+    if (p.length >= MAXSIZE) // Õ»Âú
+        return ERROR;
+    // todo list  //½«ÔªËØeѹÈëÕ»¶¥
+    *(p.top) = e;
+    // todo list  //Õ»¶¥Ö¸Õë¼Ó1
+    p.top++;
+
+    p.length++;
+    return OK;
+}
+
+// ³öÕ»
+char Pop(Stack &p)
+{
+    char e;
+    // if(//todo list) // Õ»¿Õ
+    if (p.length == 0) // Õ»¿Õ
+        return ERROR;
+    // todo list   //Õ»¶¥Ö¸Õë¼õ1
+    p.top--;
+    // todo list   //È¡Õ»¶¥ÔªËØ
+    e = *p.top;
+
+    p.length--;
+    return e;
+}
+
+// 1¡¢ÅжÏÊÇ·ñΪ»ØÎÄ´®
+void Palindrome(Stack &S, char a[])
+{
+    int i;
+    // Õ»Çå¿Õ
+    S.top = S.base;
+    S.length = 0;
+    for (i = 0; a[i] != '\0'; i++)
+    {
+        // todo list   //forÑ­»· °Ñ×Ö·û´®È«²¿ÈëÕ»Push()
+        Push(S, a[i]);
+    }
+    for (i = 0; a[i] != '\0'; i++)
+    {
+        // todo list   //forÑ­»· ¶Ô±È´®µÄÁ½¶ËÔªËØ£¬Èç¹ûPop(S) != a[i]Ôò±íÃ÷²»ÊÇ»ØÎÄ,Í˳ö
+        if (Pop(S) != a[i])
+            break;
+    }
+    if (i == strlen(a))
+    {
+        printf("------»ØÎÄ------\n");
+    }
+    else
+    {
+        printf("----²»ÊÇ»ØÎÄ----\n");
+    }
+}
+
+// 2¡¢À¨ºÅÆ¥Åä¼ìÑ顪¡ª¿É²Î¿¼¿Î±¾P75
+// Ö»ÌÖÂÛÓÉÔ²À¨ºÅ()ºÍÖÐÀ¨ºÅ[]×é³ÉµÄÀ¨ºÅ
+void Matching(Stack &S, char ch[])
+{
+    int flag = 1; // flag³õʼΪ1£¬µ± flag = 1ʱ±íʾƥÅä³É¹¦
+    int i = 0;
+    // Õ»Çå¿Õ
+    S.top = S.base;
+    S.length = 0;
+
+    // todo list    //while×öÀ¨ºÅÆ¥Åä¼ìÑ飺
+    while (ch[i] != '\0' && flag)
+    {
+        // ÈôΪ×óÀ¨ºÅ£¬Ôò½«ÆäÈëÕ»£»
+        if (ch[i] == '(' || ch[i] == '[')
+        {
+            Push(S, ch[i]);
+        }
+        // ÈôΪÓÒÀ¨ºÅ£¬ÔòÓë³öÕ»µÄÕ»¶¥ÔªËؽøÐбȽϣ¬·ÖÎöÊÇ·ñÄܹ»Åä¶Ô£¨Èç¹û²»Æ¥Å䣬עÒ⽫flagÖÃΪ0 £©¡£
+        else if (ch[i] == ')' || ch[i] == ']')
+        {
+            if (S.length == 0)
+            {
+                flag = 0;
+            }
+            else
+            {
+                char top = Pop(S);
+                if ((ch[i] == ')' && top != '(') || (ch[i] == ']' && top != '['))
+                {
+                    flag = 0;
+                }
+            }
+        }
+        i++;
+    }
+
+    if (S.length == 0 && flag) // Õ»¿ÕÇÒflag = 1ʱ£¬À¨ºÅÆ¥Åä
+        printf("-----À¨ºÅÆ¥Åä-----\n");
+    else
+        printf("----À¨ºÅ²»Æ¥Åä----\n");
+}
+
+int main()
+{
+    char a[20], b[20];
+    Stack s;
+    InitStack(s);
+    int choose = -1;
+    printf("------------------------------------\n");
+    printf("1.ÅжÏÊÇ·ñÊÇ»ØÎÄ×Ö·û´®\n");
+    printf("2.ÅжÏÀ¨ºÅÊÇ·ñÆ¥Åä\n");
+    printf("0.Í˳ö\n");
+    printf("------------------------------------\n");
+    while (choose)
+    {
+        printf("ÇëÊäÈëÑ¡Ïî:");
+        scanf("%d", &choose);
+        switch (choose)
+        {
+        case 1:
+            printf("ÇëÊäÈëÒ»¸ö×Ö·û´®£º");
+            scanf("%s", a);
+            Palindrome(s, a);
+            break;
+        case 2:
+            printf("ÇëÊäÈëÒ»¸ö×Ö·û´®(ÓÉÔ²À¨ºÅºÍÖÐÀ¨ºÅ×é³É)£º");
+            scanf("%s", b);
+            Matching(s, b);
+            break;
+        case 0:
+            exit(0);
+            break;
+        }
+    }
+}
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