Abstract: In Humashan Park of Kunming, tree species of artificial eucalyptus forest was only straight rod Eucalyptus.Under-story vegetation types are shrubs and herbaceous-type,not pure herbal type. This was the initial stage of development of plantation as one of the main features. Eupatorium adenophorum, the alien species in the herb layer took absolute superiority. Since it had strong survival capacity for rapid development,it affected the management of artificial eucalyptus. The biomass of shrub layers was lower than that of herbaceous layer. Shannon-Wiener index H and Simpson index D of under-story vegetation of sunny slope were higher than the ones of shady slope.

Key words: Eucalyptus, under-story vegetation, plant diversity, biomass