This system takes the MCU as the core processor, uses the infrared transmitter and the infrared receiver as the sending and receiving end of command to control the car. The MCU will control two DC motors after data processing which drives the wheels respectively in order to make the vehicle forward, backward, turn right and left. The infrared tracking module holding in four different directions can help the car to track black and white line, with the use of principle that the reflection of different objects on light is consistent with its voltage feedback. This system realizes the infrared tracking and speed test which will be displayed through the digital tube.