Abstract: In order to investigate the effect of planting density on spring corn phenology,yield and agronomic traits,With Zheng Dan958,Nong Hua101,Si Dan19 and KX3564 as the object, planted in four density settings in the Northern spring corn growing areas（Inner Tumote Plains） in this research.The results showed that with the increase of planting density,the whole growth period showed extension phenomenon and the material accumulation were showed decreases; while population dry matter quality,Leaf, leaf area index,the plant height,ear height and corn grain yield advanced with the increase of the density.Under conditions of high density Zheng Dan 958 and Nong Hua 101 stimulation effect is more obvious.In addition,Correlation analysis showed that planting density significantly positive correlated with leaf area index and maize yield and negatively correlated with grain number,grain weight. Leaf area index and Acres spike are greatly influenced by the density.