A numerical simulation of evaporating spray was performed for a diesel type model engine. Calculation parameters were injection pressure, swirl ratio, number of injector hole and shape of the combustion chamber. The compressibility effect due to the compression and expansion of piston was considered in the modified k-ε turbulence model. Results showed reasonable trends for evaporation rate and droplet size with various parameters. Parametric study showed that the injection pressure and the number of injector holes had considerable effect on the evaporation rate and the droplet size, while the swirl ratio had not. With increasing injection pressure the evaporation rate was increased and the fuel vapor was widely dispersed due to the wide dispersion and active penetration of spray droplets and the strong aerodynamic interaction between spray droplets and the gas field.