The aerosol properties in northern subsurb of Nanjing is measured regularly by micro-pulse lidar of Nanjing comprehensive observation base of China Meteorological Administration.We caculated the depolarization ratio and the extinction coefficient of the aerosol,respectively acquired the profiles of depolarization ratio and extinction coefficient.We analysed the relationship of the variation trend between the depolarization ratio and the extinction coefficient,and we finally found the certain correlation existing between those two factors.Preliminary detection results showed that:at the same time,the variation trends of the two are the same on sunny and haze days, and are also the same when the ice clouds is detected, while the trends are opposite when the water clouds is detected.In other words,when detecting aerosol and ice clouds,particles of the non-spherical feature is apparent, extinction coefficient is larger;when detecting water clouds,particles of the spherical feature is apparent, extinction coefficient is larger.