Abstract: In order to solve the problems of traditional support of the roadway within soft rock in Hongmiao Coal Mine, based on the analysis of the action mechanism of bolt, anchor cable and joint support, by building more groups of experimental model, the tensile mechanical experiment of the supporting body was carried out. The interaction curve of support and surrounding rock and the optimum point of combined support were obtained from tests. Research has shown that the metal casing and nut fastening experiment of drawing force close to the real value and can be used as the experimental optimization scheme. At the same time, through the single factor experiments, factors affecting the anchoring force of combined support are analyzed deeply, and it is concluded that the effect of vertical anchoring force and transverse shear force is most critical, especially vertical anchoring force.