1. Understand the characteristics of food itself and the maintenance conditions requested. The sensitive factors that affect the main components of food, especially the nutritional components such as fat, protein, and vitamins, including light, oxygen, temperature, microorganisms, and physical and mechanical mechanics, should be discussed. And other factors.

2. For food that is easy to be oxidized, you can choose vacuum or aerated packaging, and you can also use sealed deoxidizer for packaging. But sometimes in order to reach the set request and effect, it is necessary to choose specific packaging skills.

3. Grasp relevant packaging skills and methods. For a given food, in addition to choosing the right packaging and containers, the most suitable packaging skills should be selected. The same food can often use different packaging skills and methods to reach the same or nearby packaging requests and functions.