Abstract: In order to study the impact of planting density of major agronomic characteristics and yield of different maize varieties field, choose a local representative of the 3 maize varieties by split plot design, The results showed that, the suitable planting density of ‘Yu QingYu3’ was 45000-52500 strain/hm2 in Chongqing, yield reached a maximum of 12506.25 kg/hm2; the suitable planting density of ‘Yu Dan 16’ was 52500-60000 strain/hm2 in Chongqing area, yield reached a maximum of 11255.7 kg/hm2; the suitable planting density of ‘Yu Nuo851’ was 52500-60000 strain/hm2. The yield reached a maximum of 9209.1 kg/hm2. The same species in different density yield first increased and then decreased. Explain planting density did not reach the varieties play a high yield potential density on production. Therefore, the Chongqing area could be appropriately increased planting density.