1. Physical method, i.e. packaging individual food with high strength film, so that insects can not penetrate and prevent insects. But this method must change the existing packaging production line, in addition to increasing the cost of film.

2. The chemical method is to pack food with cardboard coated with chemicals to prevent insects. The specific method is to coat the surface of cardboard with anti-insect paint. This anti-insect paint is not an insecticide, but a natural essential oil which can be used as food additive. Its function is not to kill insects, but to repel insects from the outside to prevent the invasion of insects. This will not change the existing packaging production line and maintain a lower cost.