Abstract: During the Ming and Qing dynasties，the north Jiangsu coast experienced rapid accretion，and the “coastal expansion seaward” had a profound impact on the ecological environment of coastal zone and Huai salt production. By reading historical documents，combined with modern coastal research，the results show that the coastal expansion and natural environment change was not an inhibiting factor on the development of Huai salt industry. As the coast area increased，the appropriate salt production region gradually moved toward the sea，but the natural environment condition of salt production had no change. The increase in coastal area provided more abundant grass and land resources，and the Huai salt works adapted to the coast environmental，migrated seaward，and developed prosperously form the sixteenth to the nineteenth century. Moreover，the decline of the Huainan salt works and the rise of Huaibei salt industry in the late Qing dynasty ( or the northern migration of Huai salt industry toward the coast) ，in fact，social and economic conditions drove the change. The coastal environmental changes did not prevent the development of the Huainan salt industry. On the contrary，coastal expansion played an important role in the development of Huaibei and Huainan salt industry.