Jiangsu Province has a very long coast line which has undergone a huge change of heavy mud sedimentation and erosion. The mordern coast zone are usually influenced and destroyed by erosion-collapse, coast silt-up and littoral mud-sand flow. The port construction、 shipping transportation and reclaim land from costal zone are sometimes endangered, which is the characterized geological disaster in Jiangsu Province. Through multi-temporal dynamic analysis based on arerial photographs taken respectively in 1950s, 1960s and 1980s with the scale of 1:20,000 and 1: 38,000, the erosion and sedimentation types of coast zone of Jiangsu province have been determined and classified. The most silt-mud plainshore are heavily erosed and silted up except a few stable bedrock indented coast and sandy coast. The erosed coast is about 230 km long with the erosion rate of several to several ten mpa and Puddly coast is more than 320 km long with the siltation rate of several ten to 200 mpa. among 619.1 km long coast line of the whole province. The main form of geological disaster in coast zone is the landloss for bank collapse by erosion, the other form is passage deviation in front of river mouth, port silt-up,and the form of waterway on barrier etc., which result from the transportation of sediments of littoral mud-sand flow. The main factors influencing upon geological disaster in Jiangsu coast area are tidal runoff, geological structure, oceanery hydrology, climate and man-made activities. The northward return of the Yellow river in 1855 is the dominant factor to cause the large scale rearrangement of erosion and sedimentation and to be the fundament of ongoing leveling. That is to say the projecting part of fossil Yellow river delta was erosed and the littoral flow carried sand to the two sides, resulting in large scale silt-up shore. The results of rearrangement is that the Jiangsu coast line will be straightened in several decades.