QS is the abbreviation of English quality and safety. Enterprises that have obtained the food quality and safety production license must mark the food quality and safety production license number uniformly formulated by the state on the food packaging of the smallest sales unit, and affix the food quality and safety market access mark "QS" before leaving the factory for sale.
What is not posted is not necessarily of poor quality and can't be eaten, but now the state stipulates that all the regular ones should be posted, in order to ensure that consumers can eat more safely and safely.