diff --git a/参考文档（21-30）/LocReport/SIM7000.cpp b/参考文档（21-30）/LocReport/SIM7000.cpp
index bf498e0..28d63ea 100644
--- a/参考文档（21-30）/LocReport/SIM7000.cpp
+++ b/参考文档（21-30）/LocReport/SIM7000.cpp
@@ -15,35 +15,6 @@ bool  SIM7000::begin(Stream &port)
   return false;
 }
 
-bool  SIM7000::checkSIMStatus(void)
-{
-    int count = 0;
-    while(count < 3){
-        if(check_send_cmd("AT\r\n","OK")){
-            break;
-        }else{
-            count++;
-            delay(300);
-        }
-    }
-    if(count == 3){
-        return false;
-    }
-    count = 0;
-    while(count < 3){
-        if(check_send_cmd("AT+CPIN?\r\n","READY")){
-            break;
-        }else{
-            count++;
-            delay(300);
-        }
-    }
-    if(count == 3){
-        return false;
-    }
-    return true;
-}
-
 bool  SIM7000::check_send_cmd(const char* cmd, const char* resp, unsigned int timeout, unsigned int chartimeout)
 {
     char SIMbuffer[100];
diff --git a/参考文档（21-30）/LocReport/SIM7000.h b/参考文档（21-30）/LocReport/SIM7000.h
index 6b41597..68c704c 100644
--- a/参考文档（21-30）/LocReport/SIM7000.h
+++ b/参考文档（21-30）/LocReport/SIM7000.h
@@ -9,15 +9,11 @@
 class SIM7000
 {
 public:
+    bool begin(Stream &port);
     bool check_send_cmd(const char* cmd, const char* resp, unsigned int timeout = DEFAULT_TIMEOUT, unsigned int chartimeout = DEFAULT_INTERCHAR_TIMEOUT);
     void sendCmd(const char* cmd);
     int readBuffer(char *buffer, int count, unsigned int timeout = DEFAULT_TIMEOUT, unsigned int chartimeout = DEFAULT_INTERCHAR_TIMEOUT);
-    bool setBaudRate(long rate);
-    bool checkSIMStatus(void);
-    bool begin(Stream &port);
 private:
-    char     latitude[8];
-    char     longitude[8];
     SoftwareSerial* mySerial;
  };