The relations among soil enzyme activities, soil nutrition content and stand growth in a eucalypt plantation were studied. The result is as follows: Soil enzyme activities are correlated with soil nutrition content fairly, and there is certain speciality in eucalypt plantation; the volume and biomass are correlated with soil enzyme activities fairly; soil enzyme activities in eucalypt stands with pineapple are more applicable than in those with no pineapple; but the applicable range must be further investigated before soil enzyme activities are used as appraisal indicators for soil fertility in eucalypt plantation.