This paper introduces the study of mine hoister tracking system based on infra-red laser orientation technique, the application of dual-port RAM in the distance measurement system of mine hoister and gives an operation theory of dual-port RAM IDT7132. According to its different operation modes, the hardware arbitration and software arbitration are presented, and the flow chart of data exchange with IDT7132 is given. This measure has no transmission error and no need of assistant correcting switch. At the same time, it can show the actual location of mine hoister to realize controlling the digitized speed of the hoister