Abstract: As a result of the studies,we found a way to cultivate woodoil trees in northern areas and to establish the economic plantation of clones instead of seedling afforestation.Through breeding the clones from elits trees and their selection,three high-yielding clones out of the 13 selected were finally determined.They were labeled as Zhezhou No.7,Zhezhou No.9,Zhezhou No.8.The first one was the best because of its high yield and early maturity.It was proved in our practice that the breeding of high-yielding clones of woodoil tree is not only scientifically reasonable,but also feasible.We carried out the studies,selection,determination and demonstration simultaneously,and extended the results gradually.Now the extension area has reached 53 960 mu where the quick-propagating techniques and high-yielding clones are being used successfully.