Currently human hands are still not liberated when men carry things. This paper designs and implements an remote control and intelligent following car based onSTM32, ultrasonic ranging and proportional control algorithm.The car uses STM32 as its control center, and the intelligent follower mode and the infrared remote controlling mode are both available for the car. There are two ultrasonicmodulesinstalledon the front to watch thedistance between the car and the targetat each time under the following mode.SCMadopts proportional control algorithm and controls the motor speed on the left and right side according to the watcheddistance.Itcontrols the moving direction of the car according to the received infrared signal under remote controlling mode. Experimental results show the car accurately follow probability greater than 95% and response time less than 250 ms within two meters. This design accomplishes the goal that a intelligent car can automaticallyfollow the targeteven turning 360°and peoplecan control the car remotely when necessary.The system is reliable and convenient to people.