Abstract: To solve problems of shallower soil tillage layer, weaker soil water holding capacity, increased soil bulk density, and slow improvement of soil available nutrients caused by straw returning and a single rotary tillage mode for years, representative soil was selected for six years, with conventional rotary tillage operations as control group, experiments on different mechanical tillage techniques modes of deep loosening, deep plowing, and rotary tillage before wheat swing were carried out, to explore effects on soil and wheat yield．Results showed that both deep plowing and deep loosening before wheat swing reduced soil bulk density to varying degrees and improved soil permeability．After deep plowing and deep loosening operations at three test plots, spike number per unit area and thousand grain weight were higher than control operations, and wheat yield increased by 5.66%、3.87% respectively．