Sihhu Township is located on the westmost part of Yunlin County. In the Ming Dynasty during the rule of Emperor Chongjhen over 300 years ago, immigrants from Zhangzhou and Quanzhou arrived here to cultivate the land, build schools and institutions. At that time, the village of Sihhu were surrounded by large natural lakes. The area reached Sidi in the est; Luchang and Tsaicuo in the south; Huliao and Yangdiao in the west, and Baochanghu and Dinghu in the north. Hence, immigrants from Zhangzhou and Quanzhou named the place Sihhu, which means four lakes.
In Ching Dynasty, the present day Sihhu Township were four villages consisted of four lakes. Their locations were around today Baochanghu, Sihhu, Shihhu, Dinghu and Siahu Village. By late Ching dynasty, there were around 23 villages in the township, which was governed by Jianshanbao.