This design implements a smart baby carriage which can follow the owner, avoid obstacles and realize Bluetooth control of Android mobile phone. Based on STC89C52 microcontroller, an intelligent baby carriage control system with infrared obstacle avoidance and ultrasonic tracking and positioning is designed and implemented. The baby carriage can be controlled by Bluetooth control terminal of Android mobile phone. The Bluetooth interface of Android mobile terminal is used to control the forward, backward, left turn and right turn of the baby carriage.