This study analyzed the control method of tracking and stability of a self-propelled vehicle speed by octet MCU, short cycle through composed operations, to achieve intensive correction, rapid and stable control objectives and achieve intelligent variable speed effects. Enhance the resources of small self-propelled vehicle speed control efficiency and improve safety. The method is suitable for application in small resources (memory, CPU performance) system for simplify proportional - derivative control (PD control) concept, the analysis of the experimental car, and avoid complicated algorithms.