Abstract: Experiment using HF-fumigation was conducted t o study effect of hydrogen fluoride on rubber tree saplings.Results showed that rubber tree saplings displayed typical symptoms of suffering.The higher the conc entration of hydrogen fluoride was,the more serious the symptoms were,and the hi gher the accumulation of fluoride in leaves.Young leaves were more vulnerable th an old ones,and the fluoride accumulation in old leaves was higher than in young ones.With rise in exposed concentration,electro-conductance of the plants incr eased significantly.Stomas deformed after HF-fumigation,and the higher the conc entration was,the more serious the deformity was.As the extent of damage deepene d,chlorosis of leaves occurred and chlorophyll contents gradually decreased.