Abstract: This paper analyzes the sudden abnormal gas outburst and its change during the initial mining period of the 2601 fully mechanized caving face in Zhangcun Coal Mine. It is proposed to use roof pre-cracking in the 2603 fully mechanized caving face to reduce the initial pressure step, and the inclination is high after drilling through the cut hole. Technical measures such as gas drainage in advance and increasing air supply with the increase of gas emission can eliminate the sudden abnormal gas outflow during the initial mining period, and completely solve the problem of gas exceeding the limit during the initial mining period of fully mechanized caving face. The following conclusions are drawn: the gas control technology system in the initial mining period, which is based on the back-inclined high-drainage roadway as the main body, is composed of roof pre-splitting, drilled through the cut hole, and increased air volume in the initial mining period. The sudden gas surge in the early stage solved the problem of gas overrun in the initial mining period.