Abstract: The aims are to study the effects of density on plant characters of different maize varieties, and provide a basis for breeding and high-yield field establishment. Three maize varieties‘[ Xieyu 3’(A1),‘Xieyu 4’(A2),‘Xianyu335’(A3)] were used as materials. Five planting densities and randomized block design with three repeats and 65 cm wide linewidth planting were used in this experiment. The results showed that plant heights of three maize varieties had no obvious change under five planting densities, ear heights of the three maize varieties had no significant differences, and the ear height of A2 was always higher than that of A1 and A3. The number of staminate flower branch of the three maize varieties had significant differences. Compared with that of A2 and A3, the significance of the staminate flower branch number of A1 was obvious. There was significant difference of the staminate flower branch between A2 and A3. Plant height and ear height had necessary connection. The plant height of A3 was distinctly higher than that of A1 and A2, but the ear height of A3 was distinctly lower than that of A1 and A2. The variety had more influence on plant height, ear height and the number of staminate flower branch than that of density. Varieties and planting model had significant influence on the experimental results. In order to improve plant characters to coordinate group relationship, we should choose the inbred lines with suitable plant height, lower ear height and lower staminate flower branch.