Abstract: Large scale of sand ridge group is distributed in middle Jiangsu costal area and deposition muddy sea bank is developed in near-shore area. Quantitative monitoring on the coastline changes is of great significance to tidal beach development and protection. With the Landsat and HJ1A/B images in 6 periods from 1979 to 2012 as the data source, this research was carried out to quantitatively analyze the coastline evolution and tidal flat reclamation of the coastal zone between Sheyang estuary and Beikanjian by using remote sensing and GIS technologies. According to the results of the analysis, the coastline showed a significant seaward growing trend since 1979; in the growing process, the length and sinuosity of the coastline had a decreasing trend; the growing rate increased in earlier periods but slowed down later. The research achievement has a reference for the development and protection of the coastal beach in Jiangsu Province.