Abstract: In order to understand the pressure regularity for hard thick roof mechanized face in several gobs in Datong mining area, taking the 8707 fully mechanized working face in the 11^# coal of Jinhuagong Coal Mine as the research object and using the data analysis system of fully mechanized mining data recorder to monitor the hydraulic pressure message of the support in face advance. At the same time, observing the field data of the spalling and roof falling in the fully mechanized working face in detail. Comprehensively analyzed the observation data and found the law of mine pressure as follows, ① the most step distance of periodic pressure are between 18~26 meters, the mean value is 21.93m; ② the mean dynamic factor of the mechanized face is 1.23, the pressure is not intensity; ③ the tendency of rib spalling and caving along the orientation of the working face is "M" trend; ④ the distribution of support pressure is "M" along the tendency in working face and front column hydraulic pressure is generally greater than the rear column; ⑤in mechanized face, using the ZZ6000/17/37 Bhydraulic support can meet the requirements. The results of this study have an important effect on reducing the risk of leakage of the working face, accelerating the speed of the working face and ensuring the safe and efficient mining.