Abstract: The study aims to effectively eliminate “squamous” soil hardening due to extrusion of pack roller rolling of the “rotary tillage sowing and compacting unity machine” and surface soil, and improve the key technologies including the resistance, saving cost, sowing and conserving seedling. By designing technology project, field test and demonstration were applied in heavy clay soil, light clay soil and middle loam soil, “the loosen device applied in wheat sowing process soil hardening” was developed composing of three parts: stent, adjustment components and loosen components, which could effectively eliminate soil hardening and provide good soil microhabitats for whole, orderly and strong seedlings according to the demands of agro-technique in wheat sowing process in more rainfall year at sowing stage. The device had characteristics of simple installing and dismantling with the “rotary tillage sowing and compacting unity machine”, as well as low production cost, high efficiency and easy operation. The study further perfected the structure and function of “rotary tillage sowing and compacting unity machine”, and widened the soil sowing stage, which provided technical support for anti-adversity, saving cost, sowing and conserving seedling of wheat.