According to the inquiry of official website, Haimen Municipal People's Government, Sijiazha was built at 1969, which mainly undertakes flood control and drainage, water diversion and dispatching, and some shipping functions. This time, Sijiamen was demolished and rebuilt at the original site, and the length of the navigation hole was extended from 7 meters to 8 meters, and the east-west traffic bridge was extended from 7 meters to 9 meters.