In recent years, with the improvement of people's health awareness, Dendrobium candidum once jumped to the forefront of health care products sales list and became people's "health love". However, for many people, there are still "blind spots" in the identification of Dendrobium candidum, so that when purchasing Dendrobium candidum products, they are particularly passive and careless, and may not buy genuine Dendrobium candidum at a high price. Therefore, although many people want to buy it, they are extremely wary of this product and even dare not take it. The market prices of different Dendrobium species vary greatly, ranging from tens to hundreds of thousands of yuan per kilogram. Generally speaking, Dendrobium which is sticky but not bitter to eat is more expensive. For a long time, people have used this medicine to collect wild resources by digging, but the reproduction rate of wild Dendrobium candidum is extremely low, the survival rate is low, and the yield is scarce, which leads to the extinction of Dendrobium candidum, and the price has soared. Judging from the current market, the price of pure iron Fengdou ranges from 10-20 yuan per gram, and it is available. At present, the purchase price of fresh Dendrobium candidum is still above 2000-3000 yuan per kilogram. Its output is only 0.004% of the demand, and it is hard to find one. The main medicinal part of Dendrobium candidum is the stem, and the quality evaluation is: less fiber and rich mucus. Therefore, the thicker the stem of Dendrobium candidum, the higher the price. The fuller and smoother the Dendrobium candidum formed after processing, the better. At present, there are a large number of fake and shoddy Dendrobium candidum in the Dendrobium candidum market, and only a few authentic Dendrobium candidum brands, such as Dendrobium candidum in Fulinmen, are the best Dendrobium candidum from Huoshan County, Anhui Province, with full gum.