The bun tax invoice can be opened catering. Catering is through immediate processing and production, commercial sales and service labor in one, to consumers specializing in providing a variety of alcoholic beverages, food, consumption places and facilities for food production and operation industry. Baozi, originally known as steamed buns, also known as cage cake, rumored to be invented by Zhu Geliang, is a kind of satiety is a strong staple food, is a traditional Chinese food, and is still an indispensable food in people's lives. Baozi store belongs to a kind of catering industry.