Abstract: This paper discussed the effect of some factors on characteristic value of soil and water loss,which has been completed by simulating rainfall experiment in the south region of the Loess Plateau.Runoff starting time and runoff modulus,were mainly affected by rain intensity and farming measure,while rain intensity and slope are major factors to sediment modulus.At the same time,soil and water loss prediction models were established with given definition scope,which improved the model's precision with better application potential.

Key words: Soil respiration rate, Growth season, Temperature, Soil moisture, Sloping pasture, Heihe River basin