Subsoiling is a method of loosening the soil with loosening tools such as a deep loosening shovel or chisel plow without turning the soil over. The depth can be more than 20 cm. It is suitable for the land which is not suitable for deep plowing after long time plowing and turning, and the land which has clay hard disk or white slurry layer or thick soil layer and thin plowing layer. Its function: ① break the bottom layer of the plow, white pulp layer or clay hard disk, deepen the tillage layer, ripening subsoil, and facilitate the deep rooting of crops. ② not turn the soil layer, the crop can make full use of the nutrients of the original tillage layer, maintain the microbiota, reduce the lower layer of air-susceptible microorganisms. ③Storage of rain and moisture, reduce surface runoff. ④ Retain stubble, reduce wind and water erosion. Deep loosening and plowing methods: ① deep loosening and plowing . ② interval deep pine plowing, plowing loose part of the tillage layer, the other part to maintain the original state, resulting in inter-row, intra-row virtual and real co-existence structure. Its deep pine part of good ventilation, accept rainwater. The unloosened part of the tillage is firm and can carry moisture. It facilitates root growth and enhances crop resistance.