Abstract: In order to find the most suitable density of new corn variety ‘Zhengdan988’, a filed experiment was designed with 8 kinds of densities, and the traits of plant and grain yield and its components were analyzed .The influence of densities on growth and yield of ‘Zhengdan988’ was studied. Leaf area per plant and dry matter accumulation per plant were dropped by densities increasing. The results showed that: leaf area index and dry matter accumulation were increased by densities increasing and dropped by high densities. The yield was increased first and then decreased by densities increasing. The results showed that the suitable planting density of ‘Zhengdan988’ was 6.0×104-6.75×104 /hm2.