Abstract: In view of the serious engineering problem of deep soft rock roadway deformation in Chengjiao Coal Mine, the key factors affecting the stability of surrounding rocks in deep roadway and their mechanism were analyzed, the large deformation of deep roadway surrounding rock and the mechanism of floor heave were studied, and the geological characteristics of deep roadway surrounding rock were classified.The combined support technology of "four high" bolt support, grouting anchor cable reinforcement support and floor relief, was proposed for rock roadway, and the "four high" bolt support were namely high preload, high strength, high rigidity and high anchorage point. The multilength support technology for coal roadway with thick mudstone roof was also proposed. The industrial tests were carried out in the south wing of the track roadway and 21105 upper roadway.The observation results of mine pressure show that the surface deformation is small and the support of the roadway is good.