Based on the complex geological condition, recovery mining face crossing large diagonal axis technology in Dashe Mine was analyzed, roof sandstone water treatment, reduction of oblique axis pseudo-wing angle, remote control frame were adopted. Crossing synclinal axis technology enabled to save the construction of 300 m roadway, control the flow of sandstone water into the scraper conveyor, and reduce the influence of water on coal quality and the damage to equipment. By reducing the false wing angle of the syncline axis, the roadway section of the working face was reduced and the recovery of triangulation coal was improved, providing experience for the future working face mining with super-large syncline axis.