In this paper,a Micro Control Unit(MCU) temperature controller equipped with digital controller based on the PID control theory is taking ADuC812 as its core.The hardware design method is described and a series of actual curves tested on the tube furnace with PID controller to control the temperature are given. The result shows that this temperature controller has good effect on temperature control and high utility values as well as its advantages are simple to design its hardware,low cost and low power consuption and small size.