1. Authenticity The principle of authenticity means that the relevant information marked on the product label should reflect the true quality status of the product and cannot be false or exaggerated. Article 27 of the "Product Quality Law" stipulates that product labeling "must be true." For example, producers falsely mark the production date of products, use other people's factory names and addresses, and forge production license numbers, etc., which all violate the principle of authenticity. The principle of authenticity is the embodiment of the producer's obligation of good faith in product labeling, and it is also the protection of consumers' right to know. 2. Legality The principle of legality includes two meanings. First, it means that the relevant content of the product label must be labeled in accordance with laws and regulations (including mandatory national standards and industry standards); second, it means that the relevant content of the product label must not violate the law. Prohibitive provisions of regulations (including relevant prohibitive provisions of mandatory national standards and industry standards). For example, Article 30 of the "Product Quality Law" stipulates that "producers may not forge the place of origin, or forge or impersonate other people's factory names or addresses." Article 48, paragraph 1, of the "Food Safety Law" stipulates that "labels and instructions for food and food additives shall not involve disease prevention or treatment functions." 3. Necessity Necessity, also known as appropriateness, means that the relevant content of the product label is sufficient to reflect the quality of the product and ensure consumers' right to know. The principle of necessity requires that on the one hand, relevant information that should be marked according to regulations should not be omitted; on the other hand, content that producers can mark on their own should be marked carefully. Except for mandatory labeling content, the more other content, the better. If the content of product labeling is superfluous, it may easily lead to quality disputes. The author has encountered many cases in practice: a certain food is produced and sold domestically, and the manufacturer labels it in English as well as Chinese, but the English font is larger than the Chinese or the English and Chinese meanings do not correspond. Therefore, It brought many complaints, reports and claims from professional anti-counterfeiters, triggered unnecessary quality disputes, and also brought economic losses to itself. 4. Convenience Convenience means that the contents of the product label are easy for consumers to identify and identify. Principle of convenience: First, it is required that the identification content on product labels should be clear. For example, the label printing is unclear, and the use of traditional Chinese characters for domestically produced and domestically sold products is inconsistent with convenience; secondly, the product name, factory name and address, contact number, production date, shelf life, precautions during use, etc. are important Information and products aimed at special groups such as the elderly and children should be marked in a prominent position on the label (the font can be enlarged, highlighted, arranged in front, and the color is eye-catching) to facilitate consumers to know when purchasing. Contents marked on product labels Taken together, the contents marked on product labels should include the following aspects: 1. The product's own attributes The product's own attributes refer to some information inherent in the product. Including product name, place of origin, specifications and models, grade, ingredient content, product certificate, etc. 2. Producer-related information Producer-related information reflects the producer’s main responsibility for product quality. Include the producer's name, address, contact information, etc. 3. Extended attributes of the product The extended attributes of the product refer to the information that after the production of the product is completed, the producer in order to maximize its value or in accordance with the legal provisions, the product meets the relevant regulations or meets the relevant requirements. For example, if the product produced by the producer is included in the industrial product production license catalog or the compulsory product certification catalog, after the product obtains the license or passes the certification, the product needs to be marked with the production license mark and number or the 3C certification mark. If a product obtains the title of a famous brand product or a registered trademark, the product shall be marked with the famous brand logo or registered trademark. If the product is recognized as a geographical indication product, the corresponding geographical indication should be marked on the product. If the product has passed the quality management system or environmental system certification, the corresponding system certification mark will be marked on the product. And so on. 4. Precautions and reminders Precautions and reminders play an important role in protecting consumers' health and personal and property safety. This aspect includes: production date, shelf life, storage conditions, instructions for use, warning signs or Chinese warning instructions, etc. Through the aforementioned information, consumers are informed or reminded to use the product safely and reasonably.

It should be noted that there are four aspects that should be marked on product labels. The attributes of the product and the relevant information of the producer are matters that must be marked. The extended attributes of the product should be determined according to the actual situation of the product. Notes and tips Matters should be marked according to the characteristics of the product and the principle of ensuring the safety of consumers' personal and property. Regarding exemption from product labeling, exemption from product labeling can be divided into two situations: one is no labeling at all. For example, Paragraph 2 of Article 27 of the "Product Quality Law" stipulates that "naked food and other naked products that are difficult to attach labels based on the characteristics of the product do not need to attach product labels." The second is not to label part of the product information. For example, the "General Principles for Nutritional Labeling of Prepackaged Foods" GB 28050-2011 standard stipulates that "fresh food, ready-made and ready-to-sell food, packaged drinking water, etc." do not need to have nutrition labels. The exemption from product labeling reduces the labeling obligations of producers. Therefore, there must be clear provisions in laws, regulations or relevant standards before labeling can be exempted.