Sulfur dioxide produced by sulfur combustion can be adsorbed in the gas of sulfur dioxide in traditional Chinese medicine, so it can remain in medicinal materials. When the sulfur content in medicinal materials is too high, sulfur dioxide will dissolve in water and form sulfurous acid. If it is in inorganic elements, it will form sulfite, which is difficult to volatilize and remains in medicinal materials. Traditional Chinese medicine farmers have the tradition of smoking and drying medicinal materials with trace sulfur. However, in recent years, some drug farmers and distributors have repeatedly fumigated Chinese herbal medicines with industrial sulfur exceeding the standard, which has seriously affected the quality of Chinese herbal medicines. The World Health Organization stipulates that the daily intake of sulfur dioxide should be less than 0.7 mg/kg, which is such an intake. So this is a very low limit. Some scholars have done a chronic experiment by inhaling 0.75 mg daily, and found that long-term low-dose exposure to sulfur dioxide can also cause damage, especially to the respiratory system, such as chronic rhinitis, pharyngitis, bronchitis, even bronchial asthma and even emphysema, and it may even increase the prevalence of lung cancer. According to experts' opinions, in order to achieve a certain fumigation effect and make Chinese herbal medicines easy to preserve, it is necessary to achieve a higher sulfur fumigation concentration. In the process of fumigation, generally speaking, she may have to exceed 500 (milligrams per kilogram) to achieve the real purpose of fumigation. Generally speaking, according to the research results of WHO, the concentration of 500 mg/kg sulfur fumigation medicinal materials is far below the limit of 0.7 mg/kg. If the residue of sulfur dioxide exceeds 500 (mg/kg), then you can smell a particularly pungent sour taste, a very unpleasant smell, which will cause some acute cough reactions, which is actually an acute poisoning reaction. Originally, Chinese medicine was a health care product for many people, but after sulfur fumigation, its medicinal properties will also change. It may have an impact on the efficacy of medicinal materials, or the efficacy of decoction pieces. After all, it is a chemical substance, which is likely to react with active groups in medicinal materials. For example, sulfur dioxide itself is a strong reducing agent, which will react with some hydroxyl active hormones and change some of the original chemical components of Chinese herbal medicines, thus affecting the efficacy.