Research on nonlinear evolution rule of hydrological system by using fractal theory can fully reveal the complex moving the characteristics of hydrological dynamic system.First,this paper used DPS data processing software to choose the typical years with different frequencies(25%,50%,75%),reorganized the runoff series of 1 day,7 days and 15days in Zhangjiashan hydrological station of Jinhe River in different typical year,then used the Hawthtools of ArcGIS to calculate fractal dimension of these runoff proce...