Abstract: The dust produced by coal cutting of large mining height in fully mechanized mining face is a major dust source on the working face, which seriously affects the safety of the driver and staff of the shearer. In order to investigate the influence of height and wind speed near shearer on dust concentration under negative pressure ventilation in fully mechanized mining face with large mining height（6 m）, based on the self-built similar experimental platform and FLUENT numerical simulation method, the dust distribution near shearer at different heights and same height under different wind speeds, the airflow distribution at the shearer and the migration of coal cutting dust are studied, and the comprehensive dust prevention suggestions are put forward. The similar experimental results show that the dust concentration near the lower side of the coal cutter and return air roadway increases with the decrease of height, and the low wind speed and eddy current near the coal wall and the goaf in the corner of the return air cause the dust concentration to decrease greatly. At the same height of a section, the dust concentration decreases with the increase of wind speed, and the change curve of dust concentration is relatively gentle when the wind speed is low. The numerical simulation results show that the airflow direction in front of the shearer is shifted to the shearer due to the obstruction of the airflow in the shearer drum, and the high-speed airflow will have an adverse effect on the shearer driver. On the spatial section of the shearer roadway, the closer the area near the shearer is to the roof of the working face, the greater the dust concentration is. It is suggested that the wind speed of ventilation and dust removal in fully mechanized mining face with large mining height should not be less than 2 m/s, and the spray device should be opened in the 20-50 m dust diffusion range on the downwind side of shearer. The research conclusion provides certain reference for dust control in fully mechanized mining face with large mining height.