diff --git a/src/service/ielts_ai.h b/src/service/ielts_ai.h
index 383e2b5..9e154b3 100644
--- a/src/service/ielts_ai.h
+++ b/src/service/ielts_ai.h
@@ -9,6 +9,8 @@
 #include "components/chat.h"
 #include "src/plugin/oss.h"
 
+#include <queue>
+
 namespace chat_completion {
 
 class IeltsAI final : public ChatService::Service {
diff --git a/src/service/ielts_writing_t1.cpp b/src/service/ielts_writing_t1.cpp
index 9f431e0..6df3592 100644
--- a/src/service/ielts_writing_t1.cpp
+++ b/src/service/ielts_writing_t1.cpp
@@ -17,9 +17,10 @@ grpc::Status IeltsAI::ielts_writing_t1_enrich(grpc::ServerContext* ctx, const Ch
   absl::Time step1 = absl::Now();
   liboai::Conversation convo;
   std::string system_data =
-      "You are now an ielts speaking teacher. I am an ielts student. "
-      "I give you my writing, you should help me enrich it at grammar and vocabulary. "
-      "You should give an enriched article with no more than 2000 characters. ";
+      "You are now an ielts teacher. "
+      "I give you a title, you generate a writing article. "
+      "This article should have at least 250 words and at most 300 words. "
+      "This article should not talk anything about Chinese politics";
   if (!convo.SetSystemData(system_data)) {
     LOG(WARNING) << "set system data failed";
     return grpc::Status(grpc::StatusCode::FAILED_PRECONDITION, "conversion system data not set");
@@ -29,26 +30,28 @@ grpc::Status IeltsAI::ielts_writing_t1_enrich(grpc::ServerContext* ctx, const Ch
     return grpc::Status(grpc::StatusCode::INVALID_ARGUMENT, "input empty, check your input");
   }
 
-  std::regex pattern{"\"content\":\"(.*?)\""};
-  std::smatch matches;
+  std::queue<std::string> stream_buf;
   auto stream_handler = [&](std::string data, intptr_t ptr) -> bool {
-    auto reg_begin = std::sregex_iterator(data.begin(), data.end(), pattern);
-    if (reg_begin == std::sregex_iterator()) {
-      LOG(WARNING) << "regex match failed, raw: " << data;
-    }
-    for (auto i = reg_begin; i != std::sregex_iterator(); ++i) {
-      ChatMessage resp{};
-      resp.set_content((*i)[1]);
-      stream->Write(std::move(resp));
-    }
+    stream_buf.push(data);
     return true;
   };
 
+  LOG(INFO) << "stream_buf size: " << stream_buf.size();
+
   auto openai_resp =
       _chat_completion->create_async(_model, convo, std::nullopt, std::nullopt, std::nullopt, stream_handler);
 
   openai_resp.wait();
 
+  LOG(INFO) << "stream_buf size: " << stream_buf.size();
+  while (!stream_buf.empty()) {
+    LOG(INFO) << stream_buf.front();
+    stream_buf.pop();
+    ChatMessage resp{};
+    resp.set_content("abcabc");
+    stream->Write(std::move(resp));
+  }
+
   absl::Time step2 = absl::Now();
   LOG(INFO) << "logid " << req->logid() << " uid " << req->uid() << ", enrich total cost time "
             << absl::ToDoubleMilliseconds(step2 - step1);