In order to develop the new tillage technology on the promotion of maize yield，the effect of different soil bulk density on the plant growth and yield component of maize Zhengdan 958 was conducted under pot cultivation.The results showed that maize growth and yield were greatly affected by soil bulk density.Maize plant height,stem diameter and leaf area in the whole growth period decreased by 15.7%，12.6%，28.7% under 1.6 g/cm3 in comparition to the 1.2 g/cm3 soil bulk density,while the leaf senescence rate accelerated markedly during later grainfilling stage.Root number,root length,root dry weight,root top ratio and plant dry matter accumulation decreased by 17.9%,47.0%,36.8%,20.1% and 20.7%.Grain yield was significantly and negatively correlated with soil bulk density.The grain weight of 1.2,1.3,1.4,1.5,1.6 g/cm3 treatment increased by 11.1%,18.0%,4.6%,-4.5%,-14.6% when compared to CK.Therefore,both the aboveground and underground of plant could be promoted by plowing tillage to loose the soil bulk density.