Abstract: Determining the reasonable design parameters of gas roadway is the key to ensure the gas extraction effect in mined-out area and prevent gas overrun in working face. Contrastively analyzing roof gas extraction effect in 10 working faces of Daxing Mine, from the mining height of working face, coal seam inclination and lithological characters of roof and other aspects, we analyze the influencing factors of gas extraction, which provides reference for the follow-up work of parameters design of roof gas roadway in Daxing Mine.