Abstract: In order to solve the serious problem of dust pollution in excavation working face, a dust control method based on fresh air system is proposed for the comprehensive excavation face of Hongliulin Coal Mine.A simulation test platform is built using physical similarity method, and the excavation ventilation is restored.The airflow movement law is obtained through fresh air test, and the influence of different dust removal fan working conditions on the change of fresh air flow field is analyzed.The results show that when there is no dust removal measure and only air is supplied through a compressed air duct, vortices will be generated at the front end, and the airflow direction at some points will sway, which is extremely unfavorable for dust removal; When only the dust removal fan is working, there are responsible and chaotic changes in the airflow field, and the stability of the airflow field is impacted and damaged.When the fresh air system starts dust control and removal, the overall air flow field is stable, forming a fresh air area head-on.As the suction air volume increases, the fresh air area can still remain stable.When the suction air volume is 450 m³/min, the return air side's air speed is 0.89 m/s, forming a stable and head-on blowing air field structure under the influence of the fresh air system.