1. Analytical results of enzyme activities of invertase, acid, alkaline and neutral phosphatase in 12 soil samples showed that enzyme activities in soils were closely related to soil horizons and decreased with the increase of soil depth. The intensity of enzyme activities in different soil horizons were in the sequence as follows:plough horizon>plough-pan> subsoil horizon. Catalase activity in soil was related to pH. Enzyme activity of polyphenol ogidase showed no rennarkable distribution regularity in soil profile. This enzyme in brown earth, yellow brown earth, purplish soil and yellow earth increased with the increase of soil depth. 2. Enzyme activities (except palyphenol oxidase) in black soil, red earth and yellow earth were closely related to soil organic matter. There are. also correlation among different enzyme activities. Activities of urease, catalase, invertase, protease and phosphatase in the soils with higher fertility were stronger than those in the soils with lower fertility. So enzyme activity could be used as an index for evaluation of soil fertility.