Xia, Shang and Zhou are the land of Ouyue. During the Spring and Autumn Period and the Warring States Period, it was Yue. After 306 BC, it was the land of East Vietnam. During the Qin Dynasty, Sanmen was located in the east of Vietnam, belonging to Minzhong County. In the third year of Emperor Hui of Han Dynasty (BC 192), it belonged to Dong 'ou State. In the sixth year of Jianyuan, it was the land of East Vietnam, which belonged to Huiji County and was assigned to Yangzhou. In the second year of Zhao Di (85 BC), Hewlett-Packard County was built in the east of Ou Di, under the jurisdiction of Zhang 'an, belonging to Huiji County. During the Guangwu period of the Eastern Han Dynasty (AD 25-57), Zhang 'an County and Hewlett-Packard County were changed to Zhang 'an County. In Wu Dadi (222-252), the territory in the west of Anxian County was divided into two parts, namely Linhai County, which belonged to Huiji County and was transferred to Yangzhou. In the second year of Shaotai Taiping (257), it was located in East Linhai County, Huiji County, and later belonged to Linhai County, which was assigned to Yangzhou. In the first year of Dakang (280), there were 800 households in Yinxian County and 200 households in Anbei Township, Linhai County, located in Ninghai County. At that time, Sanmen belonged to Linhai County and Ninghai County belonged to Linhai County.
Sui abandoned the county as a state, Linhai county was abolished and changed to a state, East Yangzhou was changed to Wu Zhou, Ninghai county was abolished and changed to a state, and it was transferred to Wu Zhou. In the twelfth year (AD 592), the county was changed to a feudal state. In the first year of Yang Di's great cause (605), the state was changed to a county, and Yongjia County was established, which was Yongjia County at that time.
In the first year of Tang Wude (6 18), Linhai County was set as Haizhou, and in the fourth year of Wude (62 1), Linhai County was set as Ninghai County, which was responsible for sea patrol. In the same year, Yongjia County was changed to Kuozhou. Sanmen belongs to Haizhou when it belongs to Linhai and Ninghai counties. In the fifth year of Wude (622), Haizhou was changed to Taizhou. In the seventh year of Wude, Ninghai County was abandoned and merged into Zhao 'an County. In the eighth year, Zhang 'an County was abandoned and merged into Linhai County, which belonged to Taizhou. In the first year of Emperor Taizong's Zhenguan (627), Taizhou was transferred to Jiangnan Road, under the jurisdiction of Suzhou. In the first year of Yongchang, Wuhou (689), Ninghai County was located in the northeast of Linhai County, under the jurisdiction of Guangkuanli (now Ninghai Chengguan Town). The three gates were divided into Linhai County and Ninghai County, which belonged to Taizhou. In the first year of Tianbao (742), Taizhou was renamed Linhai County. In the first year of Su Zonggan Yuan (785), Linhai County was renamed Taizhou. In the same year, Zhejiang Dongdao was established, and Yuezhou was ruled by Taizhou, which was placed under Zhejiang Dongdao.
During the Song Dynasty, two Zhejiang roads were set up in Zhejiang. In the seventh year of Zong Shenxi Ning (1074), the two Zhejiang roads were divided into two East Zhejiang roads and two West Zhejiang roads, belonging to Linhai and Ninghai counties, and moved to Taizhou. In the Yuan Dynasty, the local administration implemented the system of "running provinces". In the 14th year of Yuan Dynasty (1277), Taizhou was changed to Taizhou Road, and a general's office was set up to govern the sea. When Sanmen belongs to Linhai and Ninghai counties, it belongs to Taizhou Road and Zhejiang East Road in Zhongshu Province.
The administrative system of the Ming Dynasty attacked the Yuan Dynasty and changed Taizhou Road to Taizhou Prefecture. The Qing Dynasty inherited the Ming Dynasty and set up Hangjiahu Road, Ningshaotai Road, Jinquyan Road and Wenchu Road. At that time, Sanmen was located in Linhai and Ninghai counties, under Taizhou, and under Ningshaotai Road, Zhejiang.
In the early years of the Republic of China, Sanmen still belonged to Linhai and Ninghai counties. In the 29th year of the Republic of China (1940), in July, the town of Southeast 18 was separated from Ninghai County, 5 towns in the northeast corner of Linhai County, and 6 towns in Nantian County, and Sanmen County was set up to treat healthy ponds. In September, he moved to Haiyao Town and moved to Taizhou (sixth) administrative supervision area.
1949 February 17 Sanmen was liberated, and Sanmen county people's government was established, which was the first liberated county in Zhejiang province and was assigned to Taizhou area. 1April, 952, Nantian District was placed under the jurisdiction of Xiangshan County. On May 22nd 1954, Taizhou Commissioner's Office was revoked and Sanmen County was placed under the jurisdiction of Ningbo Special Zone. 1July, 957, the organizational system of Taizhou Commissioner was restored, and Sanmen County belonged to it. 1958 65438+February, Sanmen County was revoked, merged into Linhai County and placed under Wenzhou Special Zone. 1On June 4th, 962, the State Council approved the restoration of Taizhou area and Sanmen County. 1970 65438+ 10 Taizhou District Revolutionary Committee was established, and Sanmen County belongs to it. 1September, 978, transferred to Taizhou District Administrative Office, which belongs to Sanmen County. 1in may, 983, Liusha commune in Ninghai county was placed under Sanmen county. 1In August, 1994, with the approval of the State Council, Taizhou was reclaimed from the sea to build a city, and Sanmen County was subordinate to Taizhou City.