Mold can secrete a variety of biological enzymes, decompose organic matter and absorb its nutrients. Under the right temperature and humidity conditions, as long as there are very few nutrients, mold will grow rapidly.The use of anti-mold agents is the most commonly used method for anti-mold in the design of food packaging bags. Antifungal agent is an additive that can inhibit the growth of mold and kill mold. Its mechanism of action is mainly to reduce or eliminate the activity of various enzymes in mold cells, destroy the energy release system in the cells, and hinder the growth of electron transfer system and amino transfer system enzymes. In addition to the bactericidal effect, the antifungal agent has the following characteristics: good heat resistance, and the decomposition temperature is higher than300℃; low toxicity, and good compatibility with various plastic raw materials and additives.Polymer materials also have certain anti-mildew properties. To obtain a certain anti-mold performance of polymer materials, it is necessary to mix anti-mold substances, such as phenolic compounds, organic metal compounds, nitrogen-containing compounds, halogen-containing compounds, sulfur-containing compounds, etc., with thermoplastic resins, such as polyethylene, in a certain proportion. (PE), polypropylene (PP), PVC (pvc) mixed, and added a variety of additives, through mixing, plasticization, granulation, to obtain mildew-resistant resin. The additives should be added in a certain order and fully stirred evenly. The selection of additives should pay attention to its synergy, compatibility with resin and durability, and adapt to the process conditions. To make anti-mold polymer packaging materials with anti-mold resin, the conventional co-extrusion blown film or extrusion compounding process can be used.The anti-mold design of food packaging bags can also use measures such as vacuuming and filling inert gas to inhibit the growth of mold in a targeted manner. In addition, strictly implementing relevant standards for moisture-proof and anti-corrosion, controlling the production and product circulation environment, and preventing organic matter and moldy materials from being mixed into packages are also effective measures for food mold prevention. Before the packaging process, it must be strictly inspected to confirm that the product is dry, clean, free of traces of mold growth, and not polluted by organic substances that directly cause mold growth.