diff --git a/demo/replace.c b/demo/replace.c
new file mode 100644
index 0000000..9d66289
--- /dev/null
+++ b/demo/replace.c
@@ -0,0 +1,45 @@
+#include    "tvm.h"
+#include    "tmain.h"
+
+#define    TBL_USER_INFO            20
+
+typedef struct  __TBL_USER_INFO
+{
+   long    acct_id;
+   char    user_no[21];
+   char    user_type[2];
+   char    user_nm[81];
+   char    user_addr[161];
+   char    user_phone[31];
+}dbUser;
+
+int   main(int argc, char *argv[])
+{
+    dbUser  stUser;
+    SATvm   *pstSavm = (SATvm *)pGetSATvm();
+ 
+    /* 初始化TBL_USER_INFO表，每张表都需要初始化一次, 对于表重建后，需要重新初始化一次。*/          
+    if(RC_SUCC != lInitSATvm(pstSavm, TBL_USER_INFO))
+    {
+        fprintf(stderr, "init failed, err:(%d)(%s)\n", pstSavm->m_lErrno, 
+            sGetTError(pstSavm->m_lErrno));
+        return RC_FAIL;
+    }
+ 
+    conditinit(pstSavm, stUser, TBL_USER_INFO);                  // 绑定变量
+    conditstr(pstSavm, stUser, user_addr, "earth");              // 查询条件赋值
+    conditstr(pstSavm, stUser, user_phone, "1869112XXXY");
+
+    updatenum(pstSavm, stUser, acct_id, 2018053010);             // 查询条件赋值
+    updatestr(pstSavm, stUser, user_nm, "DeffPuzzL");            // 查询条件赋值
+    updatestr(pstSavm, stUser, user_type, "1");                  // 查询条件赋值
+    updatestr(pstSavm, stUser, user_no, "20180229");             // 查询条件赋值
+    if(RC_SUCC != lReplace(pstSavm, (void *)&stUser))
+    {
+        fprintf(stderr, "Update error: (%d) (%s), ep(%d)\n", pstSavm->m_lErrno, 
+            sGetTError(pstSavm->m_lErrno), pstSavm->m_lEType);
+        return RC_FAIL;
+    }
+
+    return RC_SUCC;
+}