Abstract: In this paper,the circulating flows in the sect ion is analyzed based on the characteristics of the curved channels. The forms of horizontal turbulent stress is established by the Prandtl turbulent stress.A formula for steady 2-D circulating velocity profile in curved channels is derived based on the Reynold Turbulent equation. The analysis indicates that formula has a simple and reasonable structure,and coincides with the survey data. We also study the lateral silt discharge in the curved channels and discover an available model for numerical simulation of the curved channels.