In order to study the phenomena and laws of complex gassolid twophase flow in the abrasive pool, the fullscale direct numerical simulation method was adopted. Based on the improved embedded boundary method, the motion coupling model of gas turbulence and abrasive particles was established to analyze the gassolid flow characteristics in the abrasive pool by using flow field control equation, numerical solution and parallel calculation. By analyzing the influence of inlet gas velocity and abrasive height on the gassolid twophase flow in the abrasive pool, a suitable scheme was selected to improve system stability. It is verified that the particle diffusion, local enrichment, wall settlement and resuspitation occur due to the coupling effect of particle, wall surface and quasiordered structure in the abrasive pool. The research results provide reference for the optimal design of the abrasive pool structure.