Abstract: Aerosol optical depth (AOD), single-scattering albedo ( ω0), size distr ibution and phase function are important parameters for depicting aerosol optica l and microphysical characteristics. These parameters can be derived with Skyrad. pack algorithm from CE 318 sunphotometer direct radiance and sky radiance measurements. Based on the instrument calibration with the cloud screening and quality control schemes employed, these above aerosol parameters for different atmospheric turbidity conditions are retrieved using Skyrad. pack algorithm and compared with those from AERONET operational algorithm presented by Dubovik,et al (2000). The retrieved parameters from Skyrad.pack algorithm are in good agreement with those from AERONET operational algorithm for most conditions. On the other hand, for the clean atmospheric turb idity ω0 and volume concentration of small size particles retrieved using Skyrad. pack algorithm show a significant discrepancy with increased calculation error, indicating that the stability of this algorithm is decreased for clean atmospheric condition. The preliminary analysis demonstrates that the retrieval results based on the Skyrad. pack algorithm are of acceptable precision under the condition of higher atmospheric turbidity and appropriate solar zenith angle and can be used to study the aerosol optical and microphysical parameters derived from the sunphotometers that are not included in the AERONET network.