Green food can be divided into Grade A green food and Grade AA green food. A-grade green food refers to the limited use of limited chemical synthetic substances in the origin and production process where the ecological environment quality meets the prescribed standards. AA-grade green food (equivalent to organic food) means that the ecological environment quality of the producing area meets the prescribed standards, and harmful chemical synthetic substances are not used in the production process. The quality and packaging of products produced and processed according to specific production operation procedures meet specific standards, and the A-grade and AA-grade green food marks are approved by specialized agencies.

Consumers should recognize the "signs" when buying such foods. The green food sign consists of three parts, namely, the sun above, the leaves below and the flower buds in the middle. The sign is a right circle, indicating protection and safety. A-level signs are white characters on a green background, while AA-level signs are green characters on a white background. The logo was approved and issued by China Green Food Association.

You can identify the authenticity online: the green food mark has not been re-declared after it expired. Some enterprises are trying to save costs, and some are because their products have not actually passed the national inspection and certification of green food. Consumers can log on to "China Green Food Network" to identify the authenticity of the purchased products.