The defective rate of general steamed bread factory is around 1%. According to the inquiry of catering network, the defective rate of steamed bread factory is related to the equipment, technical level and operator skills of the production line, and the specific figures are difficult to determine. However, the defective rate of steamed bread in most efficient production lines is only about 1%. Steamed bread, called steamed bread in ancient times, or steamed buns, is the real name of steamed buns, one of the traditional pasta in China, and it is a kind of food steamed with fermented flour. Steamed bread with wheat flour as the main raw material is one of the daily staple foods of China people.