Abstract: [Objective]In order to study that plant characters’ (plant height,ear height and staminate flower branch) otherness under the diffenrent maize variety and plant density and discuss how to improve maize group’s plant characters to achieve corn super-high-yield. [Method] The experimental design with the three corn materials was a randomized block with fifteen treatments and three replications. The area of each plot was 50 m2(20 m length × 2.5 m width). [results] The results showed that’Xianyu335’>‘Xieyu 4’>‘Xieyu 3’ on maize plant height and ’Xianyu335’ have difference with the 0.01 level under the five planting density with ‘Xieyu 3’. ‘Xieyu 4’>‘Xieyu 3’>’Xianyu335’ on corn ear height and three maize varieties have difference with the 0.05 level and have difference with the 0.01 level under some planting density. ‘Xieyu 3’>‘Xieyu 4’>’Xianyu335’ on staminate flower branch and three maize varities have difference with the 0.01 level. [Conclusion] Maize variety have the obvious effect on plant height,ear height and staminate flower branch.Ear height haven’t obvious relationship between with plant height.Every variety have different result in ear height and plant height.If you want to improved plant characters of corn,you should choose selfing line from breeding.you should choose proper plant height、lower ear height and lower staminate flower branch’s selfing line.