Rebar rock bolt has been widely used in the mining industry since the 1990's, however, its thread geometric parameters are still the same as those of steel tendon used in civil engineering, which is designed for the steel-concrete structure without ground stress and the deformation of the structure is normally within elastic stage. With the development of deep resource mining, the surrounding rock of the underground roadway has large deformation. The geometric parameters of the rebar bolt designed for the ground building should be optimized for the geological conditions such as high ground stress and large deformation of soft surrounding rock. Based on the load transfer mechanism of anchorage mechanics, this paper clarifies that the rib of the rebar is the bearing body of bolt support, and the anchorage performance of the bolt is closely related to the geometric parameters of the rib. By analyzing the failure mode of anchorage, the failure mode of the anchorage section is classifi