Abstract: The effect of solid particles on the jet flow field and sound field was investigated. Six different turbulence models were to analyze the steady-state calculation of free jets. It s found that the RNG k-ε model was most suitable for numerical simulation of steady-state jets. The LES model was used to calculate the unsteady results of the jet flow, and the FW-H equation was used to analyze the jet sound field. The comparison with the experimental data verified the correctness of the numerical model. Based on this model, the effect of solid particles on the free jet flow field and sound field was studied. The simulation results show that the presence of solid particles reduces the supersonic length of the jet flow field and significantly increases jet temperature. And it increases the noise in the downstream region of the jet and reduces the noise in the mid-upstream region.