1, look at the packaging. Authentic milk powder, well-packaged, tightly sealed and regular, printed with commodity name, factory name, production address, production date, batch number, shelf life (or shelf life), ingredient list, main ingredient content and trademark. The above-mentioned enlistment signs, or the packaging seal is not strict, the trademark is vague, and the marking text is vague. , are fake and shoddy goods. 2, try to feel: pinch the milk powder packaging bag with your fingers and rub it back and forth. The real milk powder is delicate in texture and will make a "squeaky" sound; The inferior milk powder is mixed with soft candy, glucose and other ingredients, and the particles are thicker, which will make a "rustling" sound. 3, color recognition: real milk powder is natural milky yellow; Inferior milk powder is white, crystalline and shiny, or bleached white, or has other unnatural colors. 4, smell: open the package, the real milk powder has the unique milk flavor of milk; Inferior milk powder has little frankincense or even no milk smell. 5, taste: put a little milk powder in your mouth to taste, the real milk powder is delicate and sticky, easy to stick to teeth, tongue and palate, fast to dissolve, sugar-free and sweet (except sugar-added milk powder); Inferior milk powder dissolves quickly in the mouth, does not stick to teeth, and has a strong sweetness. 6, look at the dissolution rate: put the milk powder into the cup and rinse it with cold water. Real milk powder needs to be stirred and dissolved into milky turbid liquid; Inferior milk powder can dissolve or precipitate automatically without stirring. When washed with hot water, the real milk powder forms suspension and floats, and will stick to the spoon at the initial stage of mixing; It dissolves quickly when mixed with inferior milk powder, and has no smell and color of natural milk. In fact, the so-called "instant" milk powder is mixed with auxiliary materials, and there is no real instant pure milk powder.