The purpose of the study is to explore the soil infiltration and runoff generation characteristics of small watershed in hilly semi-arid area of North China

Which can not only provide scientific basis for soil and water loss harness

but also for raising the rainwater use rate and rainwater use efficiency.Results showed that the runoff and sediment storage efficiency in the crops

forestry and grazing lands were increased 35.7%~91.0% and 46.2%~88.6% than that in barren land

and the effects of runoff and sediment storage were very significant.Meanwhile

Philip Infiltration theory and Stepwise Regression Analysis method were used in analyzing the infiltration and runoff results of the simulated rainfall and natural rainfall experiment

and the soil infiltration fitting equations and regression equations for the correlation between runoff amount and its correlative factors of small watershed were created.These equations showed that runoff generation coefficient had a good relationship with topographic slope

rainfall intensity

vegetation cover

soil moisture content before rainfall and soil porosity factors.