Abstract: Eleven species of ectomycorrhizal fungi on Pinus and Eucalyptus in south China have been found, among them, Pisolithus tinctorius and Scler-oderma polyrhizum which symbiotically grow with many species of Pinus and Eucalyptus are common species of ectomycorrhiza in the area. When the air temperature is above 20℃, the relative humidity is above 80% and abundant in precipitation, many carpophores of ectomycorrhiza fungi will appear. Under different natural conditions, the distribution of ectomycorrhiza fungi is distinctly different.