This article dissertates about the consequence for runoff and influent by slope's vegetation and determines the relation of vegetation coverage density with watercourse on lamina,vegetation coverage density with influent on slope,precipitation intensity with influent on slope.The outcome of study allestes that flow of water on lamina and influent on slope sensibly increases vegetation coverage density or precipitation intensity.The flow on lamina is 25-30% of all precipitation when vegetation coverage density attains 95%.Vegetation reduces slope erosion by precipitation,increases the influent,raises the content of water in soil,has effects on the keeping the soil and water on slope.