Packaging is the external performance and marketing means of the product. For packaging, many countries have made a clear and concise definition. For example, the United States is: packaging is the preparation for the shipment and sale of products; the United Kingdom is: packaging is the artistic, scientific and technical preparation for the transportation and sale of goods; Canada believes that packaging is the supply of products The tool that can be delivered to the customer or the consumer to keep the product in good condition; China's definition of packaging is: a general term for protecting products during the circulation process, facilitating storage and transportation, and promoting sales. Today, people are more aware of packaging and give a broader meaning. From the perspective of system theory, the purpose, requirements, components, functions and practical operations of packaging are linked to form a complete packaging concept.