An inverse method is introduced to derive aerosol optical properties by using direct solar radiation and sky scattering radiation. Based on the method, aerosol optical properties including aerosol optical depth, Angstrom exponent, single scattering albedo, scattering phase function and polarized phase function are retrieved from measured data by the sun photometer. A useful method is provided to acquire single scattering albedo, scattering phase function and polarized phase function of aerosol for application on remote sensing.