Alcohol food and oily food will make lead in PVC plastic bag dissolve into food, and this plastic bag cannot contain food with temperature above 50 ℃. In addition, ordinary plastic bags cannot contain food and put it into the microwave oven for heating. The heating of plastic bags is easy to produce carcinogens, which is very harmful to human health. Consumers should use special microwave ovens to heat plastic films. Consumers should use special food packaging bags to hold food, especially the plastic bags with special dark colors, which are likely to be reprocessed from recycled plastics, and should resolutely avoid being used for food packaging.