To control the soil and water loss of the eroded area in Hetian County, the suitability observation and growth analysis has been done for many years and get conclusion. It advanced that developing economic forest should take Acacia mearnsii and Dalbergia balensae as major part. Forest for soil and water conservation should be mixed with trees and shrubs, that is, Pinus massoniana+Cyclobalanopis myrsinaefolia+Lespedeza formosana. Better variety for firewood is Eucalyptus camaldulensis. In respect to plant fruit trees it is suggested to develop Prunus persica, Prunus salicina,Prunus mume, Myrica rubra and Castanea mollissima in priority.