Qidong is a river and marine sedimentary plain in different periods of the Yangtze River estuary. Before the Han dynasty, it was still the estuary waters; Before the mid-Qing Dynasty, small sandbanks on the north side of Chongming in the Yangtze River estuary rose one after another and became a whole in the late Qing Dynasty. Because the land is uneven, today's Qidong area once belonged to the jurisdiction of three counties. Northern Lvsi region belonged to Haimen in Song, Yuan and Ming Dynasties, and was later revoked by Haimen County and placed in Tongzhou.
North Lvsi area was under the jurisdiction of Tongzhou (Nantong County) from the late Ming Dynasty to 1942. The central part was originally Haiting (Haimen County); The southern part originally belonged to Chongming County, which is called Chongming Outer Sand. 1928 In March, Chongming Waisha was separated from Chongming County and Qidong County was established. 1September, 942, in order to meet the needs of the situation in War of Resistance against Japanese Aggression, Qidong County, Haimen, Chongming and Tongdong were merged into the jurisdiction of the Southeast Administrative Office, and were under the jurisdiction of the Fourth Division of Central Jiangsu. After the victory of War of Resistance against Japanese Aggression, the Southeast Administrative Region was abolished and divided into counties, and it was merged into the Southeast Administrative Region in February 1946.
1949 65438+ 10, Qidong was liberated and the organizational system of Qidong county was restored. Considering that Qidong County was too narrow, Nantong County and Haimen County were too long to manage, Haidong, Erqu East of Haimen and Lvsi District East of Nantong County were merged into Qidong County. 1September, 954, Wangbao District 12 township of Haimen County was merged into Qidong County. In 65438+February of the same year, Tongxing Farm in Haimen County was also assigned to Qidong County. 1989165438+1October 13. With the approval of the State Council, Qidong County was abolished and Qidong City was established, with the municipal government stationed in Huilong Town.