Abstract: Aerosol radiative properties are key factors in the process of aerosol radiative forcing calculation. The scattering phase function and asymmetry factor facilitate the illustration of the direction of radiative transfer and the estimation of parameters in remote sensing.In the early summer of 2014, aerosol radiative parameters are obtained at Raoyang Meteorology Administration (an agricultural district) with a latest three-wavelength polar nephelometers (Aurora 4000) developed by EcoTech, Australia. Compared with the previous model, the instrument is unique in that it can measure the volume scattering coefficient from Θ through to 170° degrees and Θ is 10°, 15°, …, 90°. Based on the volume scattering coefficient, the scattering phase function can be computed with the traditional formula between them. What's more, one improved approach is proposed to calculate the asymmetry factor with the combination of scattering phase function and backscattering ratio. The backscattering ratio used can be calculated from the backscattering coefficient and total scattering coefficient as defined. Aerosol radiative properties of PM_2.5 including calculated scattering phase function and the fitted asymmetry factor are presented during the observation between 16 June and 18 August in 2014. The result suggests that the improved HG aerosol particle phase function can fit the aerosol scattering phase function observed at Raoyang Meteorology Administration of Hebei well. Observed results of forward scattering phase function (15°-20°) and the backscattering ratio are all in good agreement with the numerical results. The average asymmetry factors at the wavelength of 635 nm, 525 nm and 450 nm are 0.53, 0.57 and 0.57, respectively, with no significant difference possibly due to the size distribution of aerosol. The value of it at 525 nm are accordant with analysis of previous experiments, which indicate the asymmetry factor of dry aerosol are in the range of 0.55 and 0.63 (550 nm). Two examples of different pollution status (dirty period and clean one) are chosen, depending on the scattering coefficient, and the radiative properties are different. During two dirty periods, values of asymmetry factor are between 0.55 and 0.63, which is larger than those in clean periods. For asymmetry factor, mean values at 635 nm, 525 nm and 450 nm wavelength are in the range of 0.51-0.53, 0.54, 0.54, respectively. Such results provide more details and supports for further study of radiative effects of aerosol.