Abstract: The Hujiahe Coal Mine used fully mechanized sub level caving mining, mining and tunneling interact is significantly with " five lanes in one working face" arrangement. During tunneling period of drainage tunnel in 401102 face, strong dynamic disaster caused serious damage to the equipments. The article analyzed its mechanism combined with the mine pressure theory, the mainly power source factor of dynamic behavior is lateral abutment pressure caused by lateral hanging arch. In order to reduce the dynamic behavior strength, the breaking roof blasting and large aperture pressure relief measures for lateral gob hanging arch were introduced, and some suggestions for roadway support, individual protection, safety management and continuous mining were put forward too.