An electric vehicle drive system includes a controller area network (CAN) bus, a plurality of sensors, a vehicle functional module, a database device, an artificial intelligence (AI) computer and an intermediate agent device electrically connected to the database device, the vehicle functional module and the AI computer, and used to identify the kind of the vehicle functional module, match out a communication format corresponding to the kind of the vehicle functional module, produce an instruction complying with the communication format by simulating another instruction received from the AI computer, and send the instruction to the vehicle functional module for performing a specific function for a vehicle.