GPS utilizes the global navigation system, which can determine the ground position in time by receiving satellite signals. Modern technology transmits the ground position determined by GPS to some professional positioning platforms through GSM wireless network, and marks the current position on the platform. Users can use this method to easily get the location of the target. The application of GPS in car trackers has been applied to all aspects of life. In police investigations, GPS car trackers are absolutely indispensable. After the police put the GPS tracker on the action tool of criminals, it can In the police monitoring center, it is very convenient to see all the areas and action routes of the criminals, so as to find the criminal dens in time and solve the hidden dangers of public security. GPS is an indispensable platform in car tracking. At present, there are many such platforms in China, which have various built-in electronic maps and GOOGLE satellite images. The location information uploaded by the GPS car tracker is always marked, so that the user can understand the location of the target at a glance.