diff --git a/tests/examples/lua/OpenResty/rest/test.lua b/tests/examples/lua/OpenResty/rest/test.lua
index c1bde3a6022c38f53dc296e0deda29a8475f599e..179950cbe7cc294cd53a538baecefda28fe30bcc 100644
--- a/tests/examples/lua/OpenResty/rest/test.lua
+++ b/tests/examples/lua/OpenResty/rest/test.lua
@@ -1,6 +1,6 @@
 local driver = require "luaconnector51"
 local cjson = require "cjson"
-ngx.say("start:"..os.time())
+ngx.say("start time:"..os.time())
 
 
 local config = {
@@ -24,10 +24,9 @@ end
 
 local res = driver.query(conn,"drop database if exists nginx")
 if res.code ~=0 then
-   ngx.say("create db--- failed: "..res.error)
-
+   ngx.say("drop db--- failed: "..res.error)
 else
-   ngx.say("create db--- pass.")
+   ngx.say("drop db--- pass.")
 end
 res = driver.query(conn,"create database nginx")
 if res.code ~=0 then
@@ -39,8 +38,7 @@ end
 
 res = driver.query(conn,"use nginx")
 if res.code ~=0 then
-  ngx.say("select db--- failed: "..res.error)
-
+   ngx.say("select db--- failed: "..res.error)
 else
    ngx.say("select db--- pass.")
 end
@@ -79,7 +77,7 @@ else
     end
 
 end
-
-ngx.say("end:"..os.time())
+driver.close(conn)
+ngx.say("end time:"..os.time())
 --ngx.log(ngx.ERR,"in test file.")
 
diff --git a/tests/examples/lua/OpenResty/so/luaconnector51.so b/tests/examples/lua/OpenResty/so/luaconnector51.so
index 6d26bb8779f438acd2d0d05245a788b0295239d6..442de6e39f909e1aeb869988722b84795c048855 100755
Binary files a/tests/examples/lua/OpenResty/so/luaconnector51.so and b/tests/examples/lua/OpenResty/so/luaconnector51.so differ
diff --git a/tests/examples/lua/README.md b/tests/examples/lua/README.md
index e578c27119fc13c1d9d986575a8c9c41fcf8b276..dd9c9d07874e455329e43c7f77e806eb3634622c 100644
--- a/tests/examples/lua/README.md
+++ b/tests/examples/lua/README.md
@@ -25,6 +25,8 @@ lua test.lua
 http://openresty.org
 ```
 ## Run with OpenResty Sample
+**This section demonstrates how to get binary file for connector. To be convenient for trial, an connector has been put into OpenResty work directory.
+Because of difference on C API between Lua5.3 and Lua5.1, the files needed by connector for OpenResty are stored in local source directory and configured in script build.sh.** 
 
 Build driver lib:
 ```
@@ -33,7 +35,9 @@ cd lua51
 ```
 Run OpenResty sample:
 ```
-openresty -p .
+cd ..
+cd OpenResty
+sudo openresty -p .
 curl http://127.0.0.1:7000/api/test
 ```
 
diff --git a/tests/examples/lua/lua51/lua_connector51.c b/tests/examples/lua/lua51/lua_connector51.c
index 6b52c4c5291110c46249a282715b0cad94d9239f..9b932337febb204eada021ececa02bc59cf6d5db 100644
--- a/tests/examples/lua/lua51/lua_connector51.c
+++ b/tests/examples/lua/lua51/lua_connector51.c
@@ -15,10 +15,10 @@ struct cb_param{
 
 static int l_connect(lua_State *L){
   TAOS *    taos=NULL;
-  char* host;
-  char* database;
-  char* user;
-  char* password;
+  const char* host;
+  const char* database;
+  const char* user;
+  const char* password;
   int port;
 
   luaL_checktype(L, 1, LUA_TTABLE);
@@ -84,15 +84,15 @@ static int l_connect(lua_State *L){
 }
 
 static int l_query(lua_State *L){
-  TAOS *    taos= lua_topointer(L,1);
-  char *s = lua_tostring(L, 2);
+  TAOS *taos= (TAOS*)lua_topointer(L,1);
+  const char* s = lua_tostring(L, 2);
   TAOS_RES *result;
   lua_newtable(L);
   int table_index = lua_gettop(L);
 
   //  printf("receive command:%s\r\n",s);
-    result = taos_query(taos,s);
-    int32_t code = taos_errno(result);
+  result = taos_query(taos, s);
+  int32_t code = taos_errno(result);
   if( code != 0){
     printf("failed, reason:%s\n", taos_errstr(result));
     lua_pushinteger(L, -1);
@@ -107,10 +107,10 @@ static int l_query(lua_State *L){
     TAOS_ROW    row;
     int         rows = 0;
     int         num_fields = taos_field_count(result);
-    TAOS_FIELD *fields = taos_fetch_fields(result);
-    char        temp[256];
+    const TAOS_FIELD *fields = taos_fetch_fields(result);
+    //char        temp[256];
 
-    int affectRows = taos_affected_rows(result);
+    const int affectRows = taos_affected_rows(result);
     //    printf(" affect rows:%d\r\n", affectRows);
     lua_pushinteger(L, 0);
     lua_setfield(L, table_index, "code");
@@ -237,13 +237,13 @@ void stream_cb(void *param, TAOS_RES *result, TAOS_ROW row){
 
   lua_call(L, 1, 0);
 
-  printf("-----------------------------------------------------------------------------------\n\r");
+  //  printf("-----------------------------------------------------------------------------------\n\r");
 }
 
 static int l_open_stream(lua_State *L){
   int r = luaL_ref(L, LUA_REGISTRYINDEX);
-  TAOS *    taos = lua_topointer(L,1);
-  char * sqlstr = lua_tostring(L,2);
+  TAOS *    taos = (TAOS*)lua_topointer(L,1);
+  const char * sqlstr = lua_tostring(L,2);
   int stime = luaL_checknumber(L,3);
 
   lua_newtable(L);
@@ -286,7 +286,7 @@ static int l_close_stream(lua_State *L){
 }
 
 static int l_close(lua_State *L){
-  TAOS *    taos= lua_topointer(L,1);
+  TAOS *taos= (TAOS*)lua_topointer(L,1);
   lua_newtable(L);
   int table_index = lua_gettop(L);
   
@@ -296,7 +296,7 @@ static int l_close(lua_State *L){
     lua_pushstring(L, "null pointer.");
     lua_setfield(L, table_index, "error"); 
   }else{
-    taos_close(taos);   
+    taos_close(taos);
     lua_pushnumber(L, 0);
     lua_setfield(L, table_index, "code");    
     lua_pushstring(L, "done.");
diff --git a/tests/examples/lua/lua_connector.c b/tests/examples/lua/lua_connector.c
index 39fb86ce478450d4a954fdda09e1b1e52b711499..920d2cdc35c51c833a4d89448ec7e643f555dbc2 100644
--- a/tests/examples/lua/lua_connector.c
+++ b/tests/examples/lua/lua_connector.c
@@ -15,10 +15,10 @@ struct cb_param{
 
 static int l_connect(lua_State *L){
   TAOS *    taos=NULL;
-  char* host;
-  char* database;
-  char* user;
-  char* password;
+  const char* host;
+  const char* database;
+  const char* user;
+  const char* password;
   int port;
 
   luaL_checktype(L, 1, LUA_TTABLE);
@@ -83,15 +83,15 @@ static int l_connect(lua_State *L){
 }
 
 static int l_query(lua_State *L){
-  TAOS *    taos= lua_topointer(L,1);
-  char *s = lua_tostring(L, 2);
+  TAOS *taos= (TAOS*)lua_topointer(L,1);
+  const char* s = lua_tostring(L, 2);
   TAOS_RES *result;
   lua_newtable(L);
   int table_index = lua_gettop(L);
 
   //  printf("receive command:%s\r\n",s);
-    result = taos_query(taos,s);
-    int32_t code = taos_errno(result);
+  result = taos_query(taos, s);
+  int32_t code = taos_errno(result);
   if( code != 0){
     printf("failed, reason:%s\n", taos_errstr(result));
     lua_pushinteger(L, -1);
@@ -106,10 +106,10 @@ static int l_query(lua_State *L){
     TAOS_ROW    row;
     int         rows = 0;
     int         num_fields = taos_field_count(result);
-    TAOS_FIELD *fields = taos_fetch_fields(result);
-    char        temp[256];
+    const TAOS_FIELD *fields = taos_fetch_fields(result);
+    //char        temp[256];
 
-    int affectRows = taos_affected_rows(result);
+    const int affectRows = taos_affected_rows(result);
     //    printf(" affect rows:%d\r\n", affectRows);
     lua_pushinteger(L, 0);
     lua_setfield(L, table_index, "code");
@@ -241,8 +241,8 @@ void stream_cb(void *param, TAOS_RES *result, TAOS_ROW row){
 
 static int l_open_stream(lua_State *L){
   int r = luaL_ref(L, LUA_REGISTRYINDEX);
-  TAOS *    taos = lua_topointer(L,1);
-  char * sqlstr = lua_tostring(L,2);
+  TAOS *    taos = (TAOS*)lua_topointer(L,1);
+  const char * sqlstr = lua_tostring(L,2);
   int stime = luaL_checknumber(L,3);
 
   lua_newtable(L);
@@ -285,7 +285,7 @@ static int l_close_stream(lua_State *L){
 }
 
 static int l_close(lua_State *L){
-  TAOS *    taos= lua_topointer(L,1);
+  TAOS *taos= (TAOS*)lua_topointer(L,1);
   lua_newtable(L);
   int table_index = lua_gettop(L);
   
@@ -295,7 +295,7 @@ static int l_close(lua_State *L){
     lua_pushstring(L, "null pointer.");
     lua_setfield(L, table_index, "error"); 
   }else{
-    taos_close(taos);   
+    taos_close(taos);
     lua_pushnumber(L, 0);
     lua_setfield(L, table_index, "code");    
     lua_pushstring(L, "done.");