Abstract: This paper analyses the stress state of the formation of normal faults by quoting the classic fault mode of Anderson. And on this basis, the paper researches the fissures development of two sides of nomal fault. In this paper, Zhaokou fault of Tongting Coal Mine is taken as research background. By means of determination of gas pressure of 7^# coal seam and statistical analysis of mining face gas emission, the paper draws a conclusion that the closer Zhaokou fault is, the smaller quantity of gas pressure and gas emission is, which verifies that Zhaokou fault controls the gas occurrence of 7^# coal seam. Through the gas emission, 7^# coal seam gas pressure is backstepped. The gas pressure of three regions is forecasted by using a polynomial regression method. The pressure measuring results are in accord with prediction conclusion.