The flow data of Jiangjia Canyon from 2008to 2009was collected and annual variations of the stream flow were analyzed.A database of soil

land use and meteorological parameters was built based on the field survey and experiments

and monthly flows and daily flows were then simulated using the SWAT model in the canyon.The simulations of monthly flows were relatively better in the dry seasons than in the rain seasons

owing to the lack of observations during the rainy seasons when debris flows frequently occurred.Daily flows were simulated separately for the dry seasons and the flood period.The Nash efficiency and correlation coefficients of daily flow simulation in both rain season and dry season were higher than 0.7

which implies that the model can be successfully used in this area.This paper contributes to the study of rainfall-runoff mechanism in Jiangjia Canyon.