Influence of trazine prometone and bladex on soil catalase and polyphenol oxidase activities was investigated at concentration of 0, 1, 10, 100 L g g^-1 and prometon+ bladex 50+ 50 L g g^-1 respectively. Results showed that both prometone and bladex can stimulate the activities of soil catalase and polyphenol oxidase, and bladex has stronger effect than prometone. The mixing application of two triazines hasn't displayed obviously synergistic effect.