QS mark is the market access mark of food quality and safety, that is, the food production license mark, and QS mark belongs to the quality mark. The use of QS mark on the food produced by the enterprise indicates that the enterprise promises that its products have passed the inspection and meet the basic requirements of food quality and safety. Before leaving the factory, the food that implements the quasi-market system of food quality and safety must be printed with (affixed with) QS mark on its packaging or logo. Without the QS logo, it shall not be sold out of the factory.

At present, China has implemented the market access system for food quality and safety in three batches of 28 kinds of food.

The first five categories: rice, wheat flour, edible vegetable oil, soy sauce and vinegar;

The second batch 10: meat products, dairy products, beverages, condiments (sugar, monosodium glutamate), instant noodles, biscuits, canned food, frozen drinks, quick-frozen rice food and puffed food;

The third batch 13: candy products, tea, wine and fruit wine, beer, yellow wine, pickles, preserves, baked goods, egg products, cocoa products, roasted coffee, processed aquatic products, starch and starch products.

The first batch of Category 5 and the second batch of Category 10 have now entered the stage of unlicensed investigation.