Based on the monthly data of MODIS Level 3,the spatio-temporal variations of Aerosol Optical Depth (AOD) over Beijing-Tianjin-Hebei-Shanxi-Shandong region from March 2000 to December 2013 have been analyzed. The results showed that:① the areal annual mean AOD varied between 0. 428 and 0. 550 for the whole region during 2000 2013,and increasing but not significant trends occurred in the past 14 years due to the greatly interannual variations. The AOD variations over the past 14 years can be divided into two stages,the first increasing stage from 2000 to 2007 with an increase rate of 1. 349% and the second decreasing stage from 2008 to 2013 with a decreasing rate of 1. 483%. Increasing trends can be found in spring,autumn and winter and the greatest increasing trend appeared in winter;the mean AOD was the highest in summer but had a decreasing trend,while the mean AOD was the lowest in winter but had an increasing trend. ② the areal annual mean AOD of the past 14 years presented a layout of high in south and low in north;Southwest Hebei and Shandong had high value with an AOD of 0. 72,north Hebei and Shanxi had low value with an AOD of 0. 23,while Beijing and Tianjin were above the average with an AOD of 0. 58;the seasonal characteristics showed that the mean AOD was the highest in summer,decreasing gradually from summer to winter and bouncing back next spring. These results are useful to further investigation of regional climate change and air pollution variation in northern China.