The dynamics of soil N and K nutrition and of the activities of soil catalase,urease and polyphenol oxidase, and their relationships during wheat growth were studied. The content of soil available N, available K and non-exchangeable K changed regularly with wheat growth. The activities of soil CAT,URE,PPO increased previously, reached a maximum during the jointing and heading stage, then decreased and gradually remained stable.No relationships were observed between the content of soil AN,NEK and soil PPO activity, the content of soil NEK and soil URE activity during the early and late period of wheat growth, the content of soil AK and soil URE,PPO activities during the late period of wheat growth, while the relationships between the content of soil AN,AK,NEK and the activities of soil CAT,URE,PPO reached significant or extremely significant level during other periods of wheat growth.