In this paper, a new method is proposed, which combine CALIPSO lidar data with AERONET data to acquire the unstable aerosol information in Taiwan. First, introduce a CALIPSO retrieval arithmetic to obtain the aerosol optical depth, and then compare the differences between CALIPSO and AERONET. By combining these two techniques we could not only have the precise site data from AERONET, but also own the change information of aerosol in southeast China from CALIPSO. Different from AERONET, we can also display the spatial properties of aerosol from CALIPSO lidar backscatter data, such as, the strength of aerosol in each layer and their change with time in the aerosphere.