Abstract: To research reinforcement arch theory of high prestress anchor bolt, we used numerical simulation to analyze prestress diffusion of the high prestressed end anchorage of the anchor bolt in rectangle coal roadway, and found that the distribution of compressive stress mainly formed in the anchor tail formation, rather than the ends, and deduced the approximate relationship arch reinforcement thickness formed in the anchor tail formation with the bolt length, simulated the mechanism and effect of the existing bolt support of Baode Coal Mine, which verified the existence of reinforcing arch at the bolt tail and its effect.