In order to clarify how to efficiently apply nitrogen fertilizer under spring wheat intercropping with pea,field experiment was conducted to study the effect of nitrogen application rates [0 (N0),90 kg/ha(N1),180 kg/ha(N2) and 270 kg/ha(N3,local normal dosage in Shanxi Province)] on growth of spring wheat and pea growth,arbuscular mycorrhizal fungi (AMF) infection rate,and spring wheat yield under spring wheat intercropping with pea.The results showed that the spring wheat of N3 treatment had the highest number of tillers at tillering stage.The plant height of spring wheat of the three nitrogen treatments was significantly higher than that of N0 treatment from jointing stage to maturity stage,especially N2 treatment.The plant height of pea of the three nitrogen treatments was higher than that of N0 treatment from the branching stage to mature stage,especially N2 treatment.At jointing stage and flowering stage,spring wheat had the highest SPAD value under N2 treatment,which was significantly higher than that of N0 treatment. From seedling stage to mature stage,SPAD value of pea was always the highest under N2 treatment.At spring wheat flowering stage,AMF infection rates of spring wheat and pea roots were maximum under N2 treatment,which were 14.7% and 25.3%,respectively.The spring wheat yields of N1,N2 and N3 treatments were 272.22 g/m²,315.94 g/m² and 255. 99 g/m² respectively,and there were significant differences between N1,N2 treatments and N0 treatment. Overall,the application of 180 kg/ha nitrogen could significantly increase the yield of spring wheat,and reduce the application rate of nitrogen fertilizer under this experiment condition.