Eucalyptus urophylla S.T.Blake has become the main species in Eucalypts plantation and as an important industry rough materials forestry species in southern China. In this thesis, E.urophylla was researched by complete diallel crossing of intraspecific and interspecific factorial crossing with E.camaldulensis, E.grandis, E.pellita of Eucalyptus. The research in order to analyse genectis effect of the main traits of crossing progeny, estimate the family and individual heritability and then provide a t...