Based on the theory of Mie scattering and assumption of particle size distribution, lidar ratios and Angstr?m exponents of many kinds of aerosols were simulated for investigating the light scattering property of aerosols. The relationships between these two parameters and the wavelength of incident light, the size and refractive index of aerosols were researched. The simulation results show that the lidar ratios of water clouds and fog at 355 nm, 532 nm and 1064 nm are all approximately 19 sr. The absolute values of their Angstr?m exponents are very small, which reveals that there is no obvious dependency between extinction coefficient and wavelength. Due to the strong absorption of soot, the lidar ratios of continental aerosols are found to be positively correlated with the content of soot. The continental aerosols have the maximum lidar ratio at 532 nm. The mean value of Angstr?m coefficients is approximately 1.3, and their extinction coefficients decrease with increasing wavelength.