Abstract: In order to solve the problem of atomization characteristics of fan-shaped nozzles, the coupling algorithm of Eulerian-Lagrangian continuous phase and discrete phase was adopted based on Taylor Analogy Breakup（TAB） model in Ansys Fluent. The fan-shaped nozzle droplet crushing, atomization formation and unsteady numerical simulation of gas-liquid two-phase flow field were realized. The research on the influence of the injection pressure and the two parameters on the fan-shaped nozzle spray height droplet velocity and droplet diameter, the discrete phase model（DPM） mass concentration, droplet flux N of atomization characteristic parameters were completed. Through the test bench to test the laser granulometer droplet sauter mean diameter D_SM, the simulation results were compared. The results show that with the increase of injection pressure and droplet velocity, the average residence time of droplet in the computational domain is shorter, and the number of droplet in the computational domain is less. Droplet sauter mean diameter D_SM, droplet size median diameter D_VM, and number of median diameter D_NM with the increase of injection pressure are more and more small. After the injection pressure is 0.3 MPa, droplet D_SM decreases to larger diameter, which is beneficial to improve the quality in the actual operation of atomization. Under windy conditions, risk of escaping droplets will also increases. Spray height has little effect on droplet D_SM. The DPM mass concentration and spray coverage area under different injection pressures are not affected by the injection pressure. Since the change of N is in inverse proportion to the cubic D_SM of droplet and the coverage area A, the quantity flux of droplet gradually increases with the increase of injection pressure. The mass concentration of DPM decreases gradually with the increase of spray height, and the spray coverage area increases gra-dually with the increase of spray height. As the D_SM of droplet changes with the spray height, the droplet number flux decreases with the increase of spray height. The variation trend of D_SM obtained by test and simulation calculation under different spray pressures and different spray heights is consistent, and the error of the whole process is less than 10%.