Abstract: Conical nozzle and centrifugal nozzle are commonly used in spray dust of mine. Using FLUENT software, the inside and outside fields of nozzles with different structures and different inlet pressure were simulated based on the VOF method. From the simulation results, the outlet velocity of conical nozzle was bigger and the coverage of centrifugal nozzle was wider. The conical nozzles with different long-radius ratios had different negative pressure zone. For the same kind of nozzle, the bigger of outlet velocity was, the better of atomization effect was, but the inlet pressure had few influence on the pressure and spray angle near the nozzle.