In order to solve the problem of anomalous phenomena simulation in the aerial warfare scene simulation, according to the basic principles of Particle System, the meaning of custom parameter's value in Vega is analyzed in a qualitative and quantitative way. Thereby, the numeric method of setting the parameters for particle system is put forward. Taking burning and exploding effects for example, which is familiar in the aerial warfare scene simulation, the parameters are set synthetically. After getting the range of parameters of simulation effect by the numeric method, the most optimized parameters are gained by simulation time after time. The simulation results prove that the numerical method is reasonable.