In order to illustrate the relatively significant antierosion effects of plants covered roads,erosion processes on earth and plants covered roads under artificial rainfall were simulated indoor and in the fields. The results showed that the processes of erosion on the earth andplants covered roads were different.Plants covered road can effectively reduce the sediment and water loess,the intension of ero sion presented descrease trend,and the variations of road erosion modulus with rainfall intensity and slope gradient can be described with exponential equations;the pocess of earth covered road presented non-stability status;there is obvious effect of runoffinceasing and erosion-descreasing for plants covered road.