In recent years, the coal mine MWD system has been widely applied in CBM drainage, geological exploration and prevention and control of water disasters due to its advantages of high efficiency and accuracy. Through the field application of the mud pulse MWD system in Detong Coal Industry of Linfen city, Shanxi Province, the accuracy and efficiency of the wireline survey tool and the mud pulse survey system is compared. The result demonstrates that the mud pulse system can be widely used in high position directional holes.