Anti-erodibility is one important index to estimate soil anti-erosio n capacity which has relation and difference with anti-scouring ability.There are tho usands of hundreds hectare Hippophaer hamnoides forest in loess plateau region

and its anti-erosion capacity has been paid more and more attention.One scientific

effective and advantage evaluation system is essential to evaluate anti-erosion capacity of Hippophae rhamnoides forest.Using principal component analysis

different evaluation system—“Optimum 1 Index”

“Optimum 2 Indexes”

and“Optimum 3 Indexes”are chosen among many indexes.