Abstract: For the study of phenomenon of drilling fluid weakening the anchoring force in the bolt drawing process, we use simulation experiment and numerical simulation to research anchoring strength performance, and obtain the drawing process of bolt and establish the numerical model under different mechanical parameters for simulation and comparison. The study shows that the bolt drawing force is greatly reduced with the increase of accumulated water, and the borehole water plays a obvious role in weakening the anchorage performance of anchorage agent; when the mechanical parameters of the bolt are fixed, the anchorage effect of the bolt is greatly affected by the bonding performance of the anchorage agent. The results obtained from the numerical simulation are basically consistent with the experimental phenomena and theoretical analysis, which indicates that the numerical software is feasible for the simulation of bolt drawing.