Abstract: The deep tillage was carried out in spring by the deep rotary tillage 30 cm,the deep tillage 30cm and the shallow tillage spin 15 cm.and the soil bulk density,soil water content,the field moisture capacity, the agronomic traits and yield of maize were measured, respectively.The results showed that he rotary tillage 30 cm,the deep tillage 30cm can effectively break the plow pan, and reduced substantially soil density and soil bulk density for 15-35cm soil layer, however,the soil moisture increased.The plant length,the root dry weight,the overground plant dry weight and the LAI improvemented under different deep tillage treatment. The breaking rate of the deep tillage was reduce under different deep tillage treatment in harvest time.The maize yield increased by 22.10% and 25.93%,respectively,compared with the control.