The label of prepackaged foods shall include the food name, ingredient list, net content and specification, name, address and contact information of the producer and/or distributor, production date and shelf life, storage conditions, food production license number, product standard code number and other contents that need to be marked (such as irradiated food, genetically modified food, nutrition label and quality grade). Include a predetermined amount of packaging and a predetermined amount of food made in package materials and containers and having uniform quality or volume label within a certain limit. After the packaging is completed, there is a definite value, which should be "a unified mass or volume label within a certain limit".