In this paper, effects of application of N fertilizer and crop residues as manure on NRR (N recovery rate) of summer maize were studied. The results showed as follows: the application of both straw and N-fertilizer improved NRR of summer maize to a certain degree. Especially optimized N-fertilizer application raised the NRR of summer maize by 3.12~7.39 kg/hm². Analysis of crop yield, net economic income and environmental impact, “incorporation of crop residues into the soil plus optimized N-fertilization” is the best model in our experiment and is worth popularizing in the suburbs of Beijing.