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A kind of in-vehicle terminal for car network system based on ARM9 has been researched and designed in this paper. The main hardware module of the in-vehicle terminal is introduced in detail and the hardware architecture has been presented as well. The software module and its implementation of the terminal have been explained in detail, including CAN (controller area network) bus module, GPRS (general packet radio service) module, GPS (global positioning system) module. The software system of the in-vehicle terminal is implemented, and a kind of practical package format and flow chart between the in-vehicle and the server is put forward. The implementation of the system indicates that cars are directed and controlled well through the terminal.