Abstract: Monitoring the dynamic changes of coastline is of great significance to the protection and development of coastal zone. Combined with multi-source synthetic aperture radar (SAR) satellite images and optical satellite remote sensing images, using rule-based object-oriented information extraction, combined with artificial visual correction, the coastline length and water area change information of Jiaozhou Bay are extracted every five years from 2000 to 2018. The results show that the coastline length of Jiaozhou Bay has increased by 43.5 km and the area of Jiaozhou Bay has shrunk by 24.9 km² in the past 20 years. The coastline changes are mainly influenced by artificial factors such as offshore aquaculture activities, port construction, and natural factors such as river sediment accumulation and tidal action. From the point of view of three key areas, human factors have led to the change of coastline and the shrinkage of sea area in Jiaozhou Bay. The shoreline changes in three key areas of Jiaozhou Bay, namely, Red Island on the north coast, Yellow Island on the west coast and Qingdao on the east coast, show that the shoreline changes in Jiaozhou Bay are mainly influenced by human factors.