19 kinds of grasses were selected to plant in the granite erosion area,Ningdu County and the quaternary red soil erosion area,De'an County,Jiangxi Province.In the three year field experiment,the indexes of rate of seedlings emergence,survival rate,average tiller number,vegetation coverage,fresh weight of root,upland part of grass's unit weight and biomass,and soil organic matter were investigated.The method of analytic hierarchy process(AHP) and fuzzy mathematics were used to evaluate the grasses.Results show that Palspalum notatum Flugge and Paspalum wettsteinit Hackel can grow well in the two test areas;Melinis minuciflora,Styiosanthes guianensis(Aubi) SW.,Setaria palmifolia.,Kummerowia striata(Thunb.)Schindl,and Digitaria sanguinalis can grow well in the granite erosion area;and Eragrostis pilosa,Lolium L.,Cynodon dactylon,Eremochloa ophiuroides,and Sorghum sudauense can grow well in the quaternary red soil erosion area.