Light scattering characteristics of missile gas plume typical particles are analyzed in theory and calculated numerically by using Mie's scattering theory, the relationship between the extinction, scattering coefficient, scattering intensity distribution and the particle diameter are obtained. The results show that the laser scattering effect of missile plume is obvious through theoretical calculations of scattering accounted for more than 50% of the total extinction. And typical missile gas plume omnidirectional scattering energy distribution is calculated, which provides theory support for related system design.