Tongjiang River is a first-class tributary of Fujiang River and belongs to the Yangtze River system. Tongjiang River is also known as Zijiang River, Zitong Water, Wufu Water, Chishui River, Yinping River, etc. There are many river names, which vary from section to section. Tongjiang River is the main tributary of Fujiang River, which originates from Longmen Mountain in Jiangyou County, flows through Zitong County and Yanting County in the south, and flows into Fujiang River in the west of Longbao Township in Shehong County, with a total length of 296 kilometers and a drainage area of 5,220 square kilometers. 1 There are many streams in the headwaters of Tongjiang River, which are distributed in tree shape in Majiao, Houba and Xiaoxiba towns in the northwest of Jiangyou County and in Yongsheng, Shuanghe, Xinfeng, Xinchun, Xinxing, Tongxing, Zhong Hua, Wensheng, Baisheng, Dongan, Hekou, Zhongxing and Qinglinkou townships 13.