We are a hilly dry land here. In the sixties and seventies of last century, rural life was mainly autumn miscellaneous grains such as sweet potatoes. Because summer wheat is to be sold as surplus grain, the ration of each member is about 100 kg. "A good production team is 120 kg each, and the production team is almost 80 kg." At that time, the planting area of sweet potato was the largest, because the yield of sweet potato was high, and the dried sweet potato could be eaten until the next autumn.