From angle of energy circulation,how to utilize solar energy efficiently by applying TRIZ theory was thoroughly analyzed. Basic design idea was described as follows. Solar energy was converted into heat energy,and then stored for forage drying. At the same time,solar energy was converted into electrical energy to provide basic lighting for the plant,circulating system which realized energy collection-transformation-storage-utilization was established in forage drying equipment. Circulating energy technology would be gradually extended to industry chain of animal products.