1, grass color: "color" brownish yellow. Cordyceps sinensis has a yellow-brown appearance and a yellow-red head. "Grass head" is mostly black, slender, flat in section and slightly yellow in color. Authentic Cordyceps sinensis is yellow, clean, bright, full and fat, yellow and white in cross section, not hollow, short in abutment, free from mildew and impurities.

2, look at the grass shape: "shape" is like a silkworm. Cordyceps sinensis, like silkworms, generally has only one "grass head", and there are few branches of Cordyceps sinensis. The base of "Caotou" is thick, and the end gradually tapers, with a length of.1~ 4cm. Authentic Cordyceps sinensis has a rough surface and obvious ring patterns, with 2~3 ring patterns. Dried Cordyceps sinensis is fragile and easily broken. After the cordyceps sinensis is broken, there are hollow or light gray pony hoof prints on the cross section. Most of the pruning shapes of Cordyceps sinensis are slender or slightly curved. Cordyceps sinensis is a symmetrical protrusion on one side and a stripe with equal parallel gaps on the other side, which is usually cast by mold.

3. Soak Cordyceps sinensis: When Cordyceps sinensis is soaked in boiling water, the insect body becomes swollen and soft, and the color of the fungus base becomes dark brown, and the insect body is closely connected with the fungus base and does not fall off. The immersion liquid has a slight smell. After soaking Cordyceps sinensis in boiling water for 1 min, it will slowly show its original shape, yellow embryo will fall off, and the pseudomycete will start to fall off and separate from the worm.

4, smell the grass: "taste" is strong. Authentic mushrooms have a natural aroma or a slight fishy smell, while counterfeit mushrooms generally have no smell.