Abstract: In order to study the influence of underground roadway crossing on the stability of air flow in the roadway，the numerical simulation method is used to establish the relevant mine roadway crossing model，and the Fluent software is used to simulate the model. Taking the wind speed at the entry of road⁃ way crossing as 1m/s，3m/s and 13m/s as examples，the air flow field of the crossing roadway under three different wind speeds is simulated，and the air flow distribution cloud diagram and static pressure cloud di⁃ agram of the roadway under each wind speed are obtained. The results show that the roadway intersection has a significant impact on the air flow distribution of the roadway. When the air flow inlet end is close to the roadway intersection，the central wind speed will increase and the wind speed on both sides will de⁃ crease. The air flow of the roadway passing through the roadway intersection and the direction of the road⁃ way at the inlet end is the smallest to be disturbed，and the roadway perpendicular to the inlet end is the largest to be disturbed，while the wind speed at the inlet end has no significant impact on the air flow distri⁃ bution through the roadway intersection. The research results provide theoretical guidance for the layout of monitoring points of mine underground ventilation system，and are of great significance to improve the ac⁃ curacy of ventilation monitoring under corresponding conditions.

Key words: roadway crossing, air flow, stability, Fluent