Take a proper amount of flour and add warm water to make a thin batter. Cover with plastic wrap in a warm place and bake overnight. Take a proper amount of dry flour and add sugar, alkali powder and dough to the fermented old flour. Put the dried noodles into the chopping board and pinch the noodles repeatedly. Knead into smooth dough, roll it into pancakes, fold the top strip repeatedly for ten times and cut it into small pieces. Knead inward repeatedly until the dough is firm, and put it on the steamer to make it bigger. Steam in boiling water 15 minutes and stew for five minutes. Multi-layered delicious old-fashioned steamed bread is ready.