Mulching is a common planting technique in dryland agriculture.Under the condition of drip irrigation with the integration of water and fertilizer，the effects of mulching of biodegradable film with different levels of nitrogen(N)fertilizer on maize growth and nitrogen utilization were investigated，thus reducing the problems of residual film pollution and excessive nitrogen application in farmland.Two types of mulch[Class II environmental biodegradable film(S)and common film(P)]and four nitrogen levels split plot experiments were set up in 2020 and 2021 in dry farming water-saving irrigation area of Ningxia.The results showed that the effects on seedling rate and emergence stage of drip-irrigated maize under S and P cover were the same，and the insulation effects were comparable at the maize seedling stage without significant differences.Under S cover，with the increase of N application，the accumulation of dry matter，N uptake and utilization，number of ears，seed weight and yield of drip irrigated maize showed a trend of increasing first and then decreasing，and was best at 240 kg·hm-2 N application，and it was not significantly different from P cover，which indicated that biodegradable mulch could be put into agricultural production instead of common mulch.Multiple regression curves were established between N application and yield，N uptake and N use efficiency of maize under drip irrigation，and the maximum yield(13338 and 13806 kg·hm-2)was obtained under S and P cover，and the both corresponding N application was 240 kg·hm-2.The maximum yields under both mulches were 6.8% and 6.1% higher than those at 360 kg·hm-2 N(N3) application，and the nitrogen fertilizer agronomic efficiency and nitrogen fertilizer bias productivity were 63.8%，45.2% and 58.7%，59.8% higher，respectively.The degradation film was consistent with common mulch in promoting crop emergence，preliminary warming，nitrogen uptake and utilization，and yield，etc.The best application of N at 240 kg·hm-2 was achieved in promoting crop dry matter accumulation，nitrogen uptake and utilization，and crop yield and efficiency.Therefore，the application of 240 kg·hm-2 of N fertilizer under S cover can be a suitable planting practice for drip-irrigated maize in the northwest irrigation area.