2. Preparation materials: appropriate amount of flour, yeast and warm water. Kneading method: pour a proper amount of warm water below 35 degrees into the basin. Add yeast powder and stir well. According to the ratio of 1 kg flour and 3 ~ 5g yeast, flour and yeast water are mixed into dough. Cover with plastic wrap, put in a warm place and wake for more than 30 minutes.