Abstract: The effects of deep loosening and minimum tillage on physiological process of panic are approached, and the mechanism of increase in the crop yield is studied from the angle of eclogical physiology of the crop. The appiicaon of new tillages improves the water regime in the crop body, raising total water content,including free water content,ratio of free water to bound water,relative water content and water potential to some extent. For this reason, the water requirement of panic decreases. Consequently,the transpiration intensity and chlorophyl content of the crop rises somewhat, which speed up crop metabolism and improve their giowth state obviously.