Abstract: In response to the current situation of deep burial in mines and tight connection of resource depletion, the application of pillar free mining technology in goaf retaining roadway along the 2-300 working face of Ganhe Coal Mine is the research object. Through the reinforcement support technology of constant resistance anchor cables, directional energy accumulation pre splitting and roof cutting technology of deep roof holes, temporary support technology of portal brackets, and the application of gravel slope blocking and anti leakage technology, an implementation plan for goaf retaining roadway has been developed, and on-site underground tests and mine pressure monitoring have been conducted, The monitoring results indicate that when the coefficient of fragmentation and expansion of the working face roof is taken as 1.31, the depth of the cutting top hole is taken as 13m, and the constant resistance anchor is taken as 15.3m, it can effectively reduce the concentration of advanced stress, control the movement of the top and bottom plates of the reserved roadway to be less than 400mm, and the shrinkage of the two sides to be less than 500mm. The reserved roadway meets the requirements of later use, effectively alleviates the tight connection situation of the mine, improves the resource extraction rate, and provides a basis for the promotion and use of the reserved roadway along the goaf in the future of the mine.