diff --git a/app/wizard_demo/pkv/action/redis_handler.cpp b/app/wizard_demo/pkv/action/redis_handler.cpp
index 1cdb7437a..052db2183 100644
--- a/app/wizard_demo/pkv/action/redis_handler.cpp
+++ b/app/wizard_demo/pkv/action/redis_handler.cpp
@@ -27,7 +27,7 @@ bool redis_handler::handle() {
 
 #if 0
     {
-	acl::string tmp;
+	std::string tmp;
 	for (size_t i = 0; i < objs.size(); i++) {
 		tmp += "+OK\r\n";
 	}
@@ -43,7 +43,7 @@ bool redis_handler::handle() {
         }
     }
 
-    acl::string buf;
+    std::string buf;
     if (!builder_.to_string(buf)) {
         builder_.clear();
         return false;
@@ -54,7 +54,7 @@ bool redis_handler::handle() {
     //if (objs.size() >= 20) { printf("reply len=%zd\r\n", buf.size()); }
 
     //printf(">>>buf=[%s]\r\n", buf.c_str());
-    return conn_.write(buf) != -1;
+    return conn_.write(buf.c_str(), buf.size()) != -1;
 }
 
 bool redis_handler::handle_one(const redis_object &obj) {
@@ -89,8 +89,8 @@ bool redis_handler::handle_one(const redis_object &obj) {
         return hgetall(obj);
     }
 
-    acl::string err;
-    err.format("%s not support yet", cmd);
+    std::string err;
+    err.append(cmd).append("not support yet");
     logger_error("cmd=%s not support!", cmd);
     builder_.create_object().set_error(err);
     return true;
@@ -115,8 +115,8 @@ bool redis_handler::set(const redis_object &obj) {
         return false;
     }
 
-#if 1
-    acl::string buff;
+#if 0
+    std::string buff;
     coder_.create_object().set_string(value);
     coder_.to_string(buff);
     coder_.clear();
@@ -238,7 +238,7 @@ bool redis_handler::hset(const redis_object &obj) {
         .create_child().set_string(name, true)
         .create_child().set_string(value, true);
 
-    acl::string buff;
+    std::string buff;
     if (!builder.to_string(buff)) {
         logger_error("build data error");
         return false;
diff --git a/app/wizard_demo/pkv/proto/redis_coder.cpp b/app/wizard_demo/pkv/proto/redis_coder.cpp
index 0dedfc7c2..8ec3f74a8 100644
--- a/app/wizard_demo/pkv/proto/redis_coder.cpp
+++ b/app/wizard_demo/pkv/proto/redis_coder.cpp
@@ -71,7 +71,7 @@ redis_object& redis_coder::create_object() {
     return *obj;
 }
 
-bool redis_coder::to_string(acl::string& out) const {
+bool redis_coder::to_string(std::string& out) const {
     for (const auto& obj : objs_) {
         if (!obj->to_string(out)) {
             return false;
@@ -118,14 +118,14 @@ bool test_redis_parse_once(const char* filepath) {
 
     printf(">>>%s: parse success<<<\r\n", __func__);
 
-    acl::string out;
+    std::string out;
 
     if (!parser.to_string(out)) {
         printf(">>>%s: build failed<<<\r\n", __func__);
         return false;
     }
 
-    if (out != buf) {
+    if (out != std::string(buf.c_str())) {
         printf(">>>%s: build failed<<<\r\n", __func__);
         printf("output:\r\n|%s|\r\n", out.c_str());
         printf("input:\r\n|%s|\r\n", buf.c_str());
@@ -134,7 +134,7 @@ bool test_redis_parse_once(const char* filepath) {
         filetmp += ".tmp";
         acl::ofstream fp;
         if (fp.open_trunc(filetmp)) {
-            fp.write(out);
+            fp.write(out.c_str(), out.size());
         }
 
         return false;
@@ -168,14 +168,14 @@ bool test_redis_parse_stream(const char* filepath) {
     }
     printf(">>%s(%d): parse successfully<<<\r\n", __func__, __LINE__);
 
-    acl::string out;
+    std::string out;
 
     if (!parser.to_string(out)) {
         printf(">>%s(%d): build failed<<\r\n", __func__, __LINE__);
         return false;
     }
 
-    if (out != buf) {
+    if (out != std::string(buf.c_str())) {
         printf("%s\r\n", out.c_str());
         printf(">>%s(%d): build failed<<\r\n", __func__, __LINE__);
         return false;
@@ -215,7 +215,7 @@ bool test_redis_build() {
         .create_child().set_string("value3", true);
 #endif
 
-    acl::string buf;
+    std::string buf;
     if (builder.to_string(buf)) {
         const char* cmd = obj.get_cmd();
         printf("%s(%d): build redis successfully, cmd=%s\r\n",
diff --git a/app/wizard_demo/pkv/proto/redis_coder.h b/app/wizard_demo/pkv/proto/redis_coder.h
index 946af19cd..ed3204c7b 100644
--- a/app/wizard_demo/pkv/proto/redis_coder.h
+++ b/app/wizard_demo/pkv/proto/redis_coder.h
@@ -29,7 +29,7 @@ public:
 public:
     [[nodiscard]] redis_object& create_object();
 
-    bool to_string(acl::string& out) const;
+    bool to_string(std::string& out) const;
 
 private:
     std::vector<redis_object*> objs_;
diff --git a/app/wizard_demo/pkv/proto/redis_object.cpp b/app/wizard_demo/pkv/proto/redis_object.cpp
index bc9b184d3..f3024043a 100644
--- a/app/wizard_demo/pkv/proto/redis_object.cpp
+++ b/app/wizard_demo/pkv/proto/redis_object.cpp
@@ -377,7 +377,7 @@ const char* redis_object::get_line(const char* data, size_t& len,
     return data;
 }
 
-bool redis_object::to_string(acl::string& out) const {
+bool redis_object::to_string(std::string& out) const {
 #define USE_UNIX_CRLF
 #ifdef USE_UNIX_CRLF
 #define CRLF    "\n"
@@ -386,7 +386,7 @@ bool redis_object::to_string(acl::string& out) const {
 #endif
 
     if (!objs_.empty()) {
-        out.format_append("*%zd%s", objs_.size(), CRLF);
+        out.append("*").append(std::to_string(objs_.size())).append(CRLF);
 
         for (const auto& obj : objs_) {
             if (!obj->to_string(out)) {
@@ -399,16 +399,17 @@ bool redis_object::to_string(acl::string& out) const {
 
     switch (type_) {
     case REDIS_OBJ_STATUS:
-        out.format_append("+%s%s", buf_.c_str(), CRLF);
+        out.append("+").append(buf_.c_str(), buf_.size()).append(CRLF);
         break;
     case REDIS_OBJ_ERROR:
-        out.format_append("-%s%s", buf_.c_str(), CRLF);
+        out.append("-").append(buf_.c_str(), buf_.size()).append(CRLF);
         break;
     case REDIS_OBJ_INTEGER:
-        out.format_append(":%s%s", buf_.c_str(), CRLF);
+        out.append(":").append(buf_.c_str(), buf_.size()).append(CRLF);
         break;
     case REDIS_OBJ_STRING:
-        out.format_append("$%zd%s%s%s", buf_.size(), CRLF, buf_.c_str(), CRLF);
+        out.append("$").append(std::to_string(buf_.size())).append(CRLF)
+            .append(buf_.c_str(), buf_.size()).append(CRLF);
         break;
     //case acl::REDIS_RESULT_ARRAY:
     //    break;
@@ -435,9 +436,7 @@ redis_object& redis_object::set_error(const std::string& data,
 
 redis_object& redis_object::set_number(int n, bool return_parent) {
     type_ = REDIS_OBJ_INTEGER;
-
-    std::string buf = std::to_string(n);
-    buf_ = buf;
+    buf_ = std::to_string(n);
     return return_parent ? *parent_ : *this;
 }
 
diff --git a/app/wizard_demo/pkv/proto/redis_object.h b/app/wizard_demo/pkv/proto/redis_object.h
index 50f83f61b..41b0ee8c3 100644
--- a/app/wizard_demo/pkv/proto/redis_object.h
+++ b/app/wizard_demo/pkv/proto/redis_object.h
@@ -68,7 +68,7 @@ public:
     redis_object& set_string(const std::string& data, bool return_parent = false);
     redis_object& create_child();
 
-    bool to_string(acl::string& out) const;
+    bool to_string(std::string& out) const;
 
 private:
     int status_ = redis_s_begin;