Abstract: Combining the structure, task features of the braking system of mine hoist with present developing situation of PC, two kinds of achieving method of the braking system of mine hoist controlled by PC are put forward——the software and the hardware. Main technical key using the software achieving method is to determine PC control algorithm. This paper analyzes and calculates PC control algorithm for the braking system of a mine hoist in details. Finally, PC control algorithm for the braking system and its achieving methods are given.