The influence of litter coverage on surface runoff and soil erosion are significant, but the characteristics of this in theKarst area are not yet clear. By doing indoor artificial simulated rainfall experiment with taking quality of litter layer and rain intensityas its influencing factors, the influence of litter layer on surface runoff and soil erosion in Karst area were studied. The resultsshow that: (1) In the case of no litter coverage, there are no surface runoff. When rain intensity is 40 mm/h and there aresurface runoff with other higher rain intensity; And, with the increase of rain intensity, the initial runoff time advance and surfacerunoff and sand producing both increased. (2) In the case of there are litter coverage, the initial runoff time delay. When rain intensityis 40 mm/h, litter coverage influence initial surface runoff significantly, but the influence become less obvious when rain intensitybecome higher. (3) The effect that litter cover reduce soil erosion is significant. When rain intensity is 90 mm/h, the efficiencyof litter protecting sand is about 99%, and which is 94% when rain intensity is 140 mm/h. These results suggest that littercoverage in Karst area plays an important role in delaying surface runoff and reducing soil erosion.