The scattered light distributions of particles with different parameters of size, shape and refractive index are simulated with Mie theory and finite difference time domain (FDTD) software. The feasibility of particle shape inversed method with scattering intensity distribution and asymmetrical factor is discussed. Based on this result, a real- time aerosol particle shape identification device (RAPSID) is developed. It can collect the forward scattered light pattern with scattering angle from 5 to 19 degree by an ICCD camera. The pattern of an 8 μm polystyrene sphere particle is approximately consistent with the result of Mie scattering calculation, which verifies the accuracy of RAPSID. The test results of RAPSID for aerosol particles with different sizes show that particles of spherical, rhabdoid and other shapes can be distinguished from scattering image and inversed calculation results.