An inter-particle collision model was established based on the direct simulation Monte Carlo (DSMC) method as well as the force analysis and the motion equation.The collision process of the particles in acoustic field was examined.Through changing the numerical simulation conditions,the influences of the characteristic parameters,such as the weight value of the number of sampling particles,the cell number and the time-step size used in DSMC method,on the particle collision rate and computational time were discussed.The results show that the higher the acoustic frequency is,the more rapidly the particle volume fraction changes and the more unevenly the particles are distributed in space.The increase of the weight value of the number has a small effect on the collision rate,but it significantly reduces the computational time.As the cell number increases,the collision rate decreases,whereas the computational time decreases rapidly at first and then almost keeps constant at lower acoustic frequency and increases slightly at higher acoustic frequency.It is also found that as the time-step size for determining the inter-particle collision increases,the collision rate increases monotonously at lower frequency,while it increases at first and then fluctuates at higher frequency.The increase of the time-step size results in the decrease of the computational time and the decrease is more obvious with a smaller time-step size.