The steamer has many functions, including pure steaming, pure roasting, combination of steaming and roasting, fermentation, sterilization and thawing. In particular, the combination of steaming and baking can be steamed before baking or steamed before baking, or even steamed before baking. A chef with high baking requirements can also meet the cooking requirements, and a steaming oven can support more than N other kitchen appliances with single functions.