In the early literature of China, the word "Jiang" refers to the river and lake system of Dongping Lake-Nanyang Lake-dushan lake-Zhaoyang Lake-Weishan Lake in the west of Shandong. Later, it gradually evolved into the Yangtze River (such as Jiangzuo and Jiangdong). ). Later, with the further promotion of language habits, it also refers to the rivers in the south of China.