Aerosol optical depth （AOD） is a key factor for characterizing aerosol content and atmospheric pollution. In this study， level 2 aerosol profile products of the CALIPSO satellite were used to analyze the temporal and spatial variation characteristics and trends of AOD in specific regions worldwide from 2009 to 2018. Results show that AOD has a certain temporal and spatial difference in different areas. On the spatial scale， high AOD value centers are mainly distributed in India， Saudi Arabia， and other regions； moreover， on the temporal scale， noticeable seasonal differences exist. Specific regions such as India， Saudi Arabia， and northern China show peak AOD during the MAM and DJF periods， while Brazil peak during the JJA period. Moreover， significant AOD trend differences exist in each typical region， with the strongest upward trend in India.