Abstract: Based on three scenes of remote sensing data from 1984 to 2016 and tide and sea level data，the spatial distribution and the changing process of tidal zone's area and centroid in Jiaozhou Bay were analyzed applying the method of "same sea level contrasting". The results show that firstly the tidal zone area is decreasing. From 1984 to 2001， the tidal zone area in Jiaozhou Bay has decreased by 52.80 km² and from 2001 to 2016 it decreased by 8.10 km². Secondly， the centroid of tidal zone has offset severely， among which the centroid of tidal zone of Huangdao offset the most. From 1984 to 2001， the centroid transferred 1 061.48 m from northwest to southeast continuously. Compared with 2001， the area of tidal zone in 2016 has offset 2 881.64 m northeastwards. Thirdly from 1984 to 2001， large-scale aquaculture， salt pan activities and smallscale sea reclamation were responsible for the reduction of the tidal zone's area and the deviation of tidal zone centroid. From 2001 to 2016， large areas of salt pan and aquaculture pond have been abandoned due to large-scale land constructions. Besides， the erosion and deposition has also contributed to the changes of the area and tidal zone centroid in Jiaozhou Bay.