The major cause that Hetian has become severe soil erosion area is that hilly regetation was destroyed by unreasonable human activity and which lead to plant community change in retrogressive suceession continuously. In order to recover regetation in Hetian erosion area and to impel sparse Pinus massonana community transfer in progression succession

hilly area should be closed at first and then broad leaf tree should be planted. So that coniferous and broad leaf mixed forest will be formed to improve enviroment slowly. After a slow process

a very stable vegetation type

that is broad leaf evergreen forest

will be successively formed.