Abstract: In order to study the effect of N levels on growth of summer maize under different drought degrees, a field experiment was carried out under rainproof sheds. There were seven drought treatments in which soil drying lasted 0, 7, 12, 17, 22, 27, 32 days and three N levels including N 0, 140, 280 kg/hm2 in this experiment. The results showed that summer maize morphological changes, including plant height, leaf blade length, leaf blade width, stem diameter, biomass and yield, increased with the amount of N fertilizer applied under slight drought condition. Under moderate soil drought, medium amount of N was better than zero N or high level of N in increasing morphological changes, biomass and yield of summer maize. Plant height, leaf blade length, leaf blade width, stem diameter, biomass and yield decreased when N amount increased under serious soil drought condition. In this experiment, the effects of N levels on summer maize differed with different drought levels, and proper N amount should be chosen so that the harm of drought can be reduced.