Vegetation revetment，as a useful technique，has been applied to slope engineering，especially in shallow slopes.However，the analysis of theory regarding vegetation revetment left behind the corresponding engineering practices.In order to alleviate it，this study first establishes weight table of root additional cohesion system based on current theories to analysis different types of vegetation(grass，shrubs，young forest，mature forest)’s additional cohesion with different depth of soil，and numerical method is adopted to analysis the reinforcement effect of different types of vegetation and different slope geometry parameters.The results show under same condition，the reinforcement effect of mature forest is best，second is young forest，third and fourth are shrubs and grass；with the increase of slope angle and slope length，the reinforcement effect of four types of vegetation are both showing a decrease trend.