In this study, an active and passive control method of intelligent cars is proposed. The STC89C51RC and K66 dual chips are used to control intelligent cars. With the Bluetooth communication technology, the car is controlled on a mobile phone APP. Meanwhile, automatic obstacle avoidance of the car is achieved with the ultrasonic ranging technology. In addition, an infrared detection sensor is added to facilitate the automatic tracking of the car. Beacon light homing is accomplished with the image recognition technology and the low-power MT9V032 camera. The experimental results show that the mobile car delivers a good tracking performance under proper lighting conditions. When the speed of the car is 20 cm/s, the obstacle avoidance accuracy reaches 99% and beacon lights within 7.85 m away from the car can be identified at a stable speed of 3.1 m/s.