Abstract: In order to solve the problems of uneven spraying, over-spraying and waste of solution caused by nozzle structure and layout in the belt antifreeze spraying system in cold mining area, the nozzle in the CaCl₂ solution spraying system of the anti-freezing station of Baorixile Open-pit Mine was taken as the research object.The existing nozzle structure was optimized, the optimized nozzle structure was simulated, the nozzle domain model was established, and the domain simulation was carried out by Fluent.The results show that when the groove angle is fixed, the spraying width increases first and then decreases with the increase of the hemisphere diameter.When the hemisphere diameter is fixed, the spraying width decreases with the increase of the groove angle, and the hemisphere diameter has a greater influence on the spraying width.Under the conditions of fixed slot cutting angle, the uniformity of water content distribution tends to be uniform after uneven distribution with the increase of hemisphere diameter.Under the conditions of fixed hemisphere diameter, the water content distribution is the most uniform when the slot cutting angle is 70°.According to the required spraying width and spraying uniformity, a nozzle with a slot cutting angle of 70° and a hemisphere diameter of 5 mm was selected.