Field shading experiment was used to simulate reduced solar radiation at different percentages of 85%,80%,60%,40%,0% in winter wheat field.The activities of soil catalase,invertase,urease and the amount of available P,K,Fe,Mn were examined during different growth stages of winter wheat.Results show that different shading percentages delayed the winter wheat growing process to different degrees.The more the radiation decreased,the more significant the phonological delay was.The decrease of radiation at 60% and 80% promoted the activity of catalase near and away from the root zone of winter wheat.Reduced radiation significantly decreased soil urease and invertase activity in the late growth stages of winter wheat.The most significant invertase activity reduction occurred when the solar radiation was reduced by 80%.The reduced solar radiations decreased the urease activity in soil.The less radiation near the root zone decreased the amount of K,Fe,Mn,with a trend as follows: CK>40%>60%>80%.