Abstract: 【Objective】 To carry out field experiments by using spring maize cultivar Ningdan 41, Ning 1530, Ningyu 51, Xianyu 335, and four planting density treatments including D₁(82,500 plants/hm²), D₂(90,000 plants/hm²), D₃(97,500 plants/hm²) and D₄(105,000 plants/hm²) were designed. 【Methods】 The influence off our planting density treatments on ear characters and yield were analyzed. 【Result】 The results showed that with the increase of planting density,the bald tip length of ear characters were increased, while 11 ear characters (measured all ear characters except bald tip length) were decreased; The results also showed that the average coefficient of variation of each maize variety was bald tip length, 100 grain weight at the top of ear and the number of grains per row was highest, while the average coefficient of variation of row number per ear, ear diameter and seed yield rate was the smallest; the variation range of 100 grain weight in the upper ear was greater than that in the middle and lower part of ear; the decreasing range of grain number per row in long ear varieties was larger than that in middle and short ear varieties, and it was the most obvious when the density was above 97,500 plants /hm². 【Conclusion】 With the increase of planting density, the number of effective panicles increased, while the number of grains per spike and 1,000 grain weight decreased significantly, the yields of Ning1530 and Ningyu 51 were the highest at the planting density of 10,5000 plants/hm², and the yields of Ningdan 41 and Xianyu 335 were the highest at the planting density of 97,500 plants/hm².