The study was conducted in three different forests of Jiuzhaigou World Nature Heritage Reserve. Surface runoff were simulated and the relationship between runoff and surface traits(herb cover, bryophyte cover,litter cover and slope gradient) and soil status(initial water content and humus thickness) were exploited. It was found that:(1) Under the same rain intensity and time, the surface traits including herb cover, bryophyte cover and litter cover strongly impacted surface runoff intensity, but soil status only displayed tiny action on it. (2)In the same slope gradients, very small differences of surface runoff intensity among different forest type were found. (3) In the same forest type, under oak forest, surface runoff changing along with slope gradients increased. Under forests mixed with spruce and oak trees and fir forest, very small differences of surface runoff intensity among different slope gradients were found.