The specific functions of the design include real time positioning and reminding the specific location of the target through SMS. This technology is based on the GPS global positioning system and uses the STC89C52 microcontroller to construct the GPS system. The design mainly utilizes the powerful processing capability of microcontrollers， as well as GPS global positioning system and GSM global mobile communication system. The received location information will be displayed on the LCD1602 LCD screen， and the microcontroller will finally send the collected latitude， longitude， and time information of the observation points to the mobile phone via SMS， which requires the use of SIM800A module.