diff --git a/src/pat.cc b/src/pat.cc
new file mode 100644
index 0000000..551927c
--- /dev/null
+++ b/src/pat.cc
@@ -0,0 +1,34 @@
+#include "pch.h"
+#include "pat.h"
+
+#include "common.h"
+#include "wechat_data.h"
+
+#define  WX_PAT_MGR_OFFSET  0x7e91c0
+#define  WX_SEND_PAT_MSG_OFFSET  0x1228510
+#define  WX_RET_OFFSET   0x1AE4A45
+
+int SendPatMsg(wchar_t* chat_room_id, wchar_t* wxid) {
+  int success = -1;
+  WeChatString chat_room(chat_room_id);
+  WeChatString self_wxid(wxid);
+  DWORD base = GetWeChatWinBase();
+  DWORD get_pat_mgr_addr = base + WX_PAT_MGR_OFFSET;
+  DWORD send_pat_msg_addr = base + WX_SEND_PAT_MSG_OFFSET;
+  DWORD ret_addr = base + WX_RET_OFFSET;
+  __asm {
+    PUSHAD
+    CALL       get_pat_mgr_addr
+    PUSH       ret_addr
+    PUSH       0x0
+    PUSH       EAX
+    LEA        ECX,chat_room
+    LEA        EDX,self_wxid
+    CALL       send_pat_msg_addr                           
+    ADD        ESP,0xc
+    MOVZX      EAX,AL
+    MOV        success,EAX      
+    POPAD
+  }
+  return success;
+}
\ No newline at end of file
diff --git a/src/pat.h b/src/pat.h
new file mode 100644
index 0000000..7893f9e
--- /dev/null
+++ b/src/pat.h
@@ -0,0 +1,4 @@
+#ifndef PAT_H_
+#define PAT_H_
+int  SendPatMsg(wchar_t* chat_room_id,wchar_t* wxid);
+#endif
\ No newline at end of file