The authose used tea-polyphenol as inhibitor and studied its effects on the urease and some other enzymes in paddy soil derived from red soil, as well as the vitality of rice roots and the growth of rice.The results show that its inhibition to urease of the paddy soil derived from red soil was fairly strong, whereas the inhibition to protein enzyme, catalase and cellulase in the soil was relatively weak.The tea-polyphenol also had a comparatively faint inhibition to the vitality of rice roots and the growth of rice.Compared with hydroquinone, the tea-polyphenol's side effects of inhibition was weaker, hence it is a better inhibitor.