Three types of maize hybrid(6 maize hybrids)were used to study the maize ear traits response to different low nitrogen(N)application level by 2 year field experiment.The three types of maize hybrids were high yield and low N tolerance,high yield and low N intolerance,low yield and low N intolerance,respectively.The results showed that there were significant or highly significant responses of maize individual kernel weight and its component traits to N stress,except for the ear rows.The individual kernel weight,ear length,ear diameter,kemel numbers per row and 100grain weight of the three types maize hybrids were all decreased with increasing of low N stress.Compared with the Nnormal control(450 kg/hm2),the reduction in individual kernel weight,ear length,ear diameter,kemel numbers per row，100 grain weight under serious low N level(45 kg/hm2)and extreme low N levels(0 kg/hm2)of the high yield and low N tolerant maize hybrids were 25.9% and 12.0%,6.5% and 0.9%,7.1% and 3.6%,9.9% and 3.2%,15.3% and 6.7%,respectively.The reduction were lesser than the others two types maize.There had more obvious deviation under low N stress for the barren tip length and 100grain weight,which were reached 12444% and 939%.The barren tip length was increased with increasing of low N stress.Under the serious low N leve and extreme low N levels,the barren tip length of high yield and low N tolerant maize hybrids，high yield and low N intolerance maize hybrids was shorter than that of the low yield and low N intolerance maize hybrids.The longer barren tip length should be a significant feature of the low yield and low N intolerance maize.So,the fecundity and 100grain weight should be emphasized during the low N stress maize breeding process,which could increase kemel numbers per row and 100grain weight because barren tip length could be reduced and kernel length could be enlarged to raise grain yield.