1. Judge by smelling the smell. Fresh mushrooms will smell fresh. On the contrary, spoiled mushrooms will smell sour.

2. From the appearance, the surface of the damaged mushrooms is a bit light gray and shriveled in shape, while the surface of the fresh mushrooms is relatively smooth and bright white in color.

3. If you find that the mushrooms are covered with a thin layer of mold, mucus, or white stuff, it means that the mushrooms are broken, so be sure not to eat them.

4. Judgment by pinching the meat quality on the surface of the mushroom. If the meat of the mushroom is not elastic and is easily deformed when pinched with your hands, and the bottom part of the mushroom is easy to turn black, it means that the mushroom is probably old. It has gone bad and is no longer edible.