In our diabetic foot treatment specialty, there have been a few patients and family members who have asked the question, “Other patients have had debridement done right after they arrived, why is it that our patient has been here for a few days and has not yet been given surgery? Is it too serious to operate?” Those who ask such similar questions are mostly dry gangrene, and today we will talk about the pathogenesis and treatment characteristics of dry gangrene and wet gangrene. First of all, let’s talk about the characteristics of dry gangrene and wet gangrene. Generally speaking, wet gangrene does not exist or exists mild arterial vascular disease of the lower limbs, the foot, especially the distal end of the toes after the appearance of wounds, even if the wound is not effectively treated the wound is infected, but the blood supply is good, sufficient moisture, will only occur purulent ulceration. However, for dry gangrene, there is mostly a heavy problem of vascular occlusion of the lower limbs, while venous return is not a problem. At this time, the blood saturation of the lower limbs is severely reduced, and the wounds will become black and dry due to long-term water shortage, and some patients even look darker than coal. Then, we talk about the characteristics of the different gangrene treatments. Wound healing must depend on an adequate blood supply, and wet gangrene can be cleared immediately because the blood supply itself is not a problem. In the case of dry gangrene, according to a large number of real cases, it has been proved that if surgery is hastily performed, the wound will still continue to be infected and necrotic upwards after the wound has been cleared, so that the patient will suffer even more. For the treatment of dry gangrene, the idea of the open therapy of integrated Chinese and Western medicine is to improve the circulation of the lower limbs before surgery. An important criterion in this assessment is that there should be a clear boundary between the necrotic tissue and the healthy tissue. In the patient above, the line was quite clear, with the necrotic dry and black, and the healthy one was not ulcerated. Later, after treatment, the line finally went down, which indicated that the patient’s circulation in the lower limbs had improved well, and after a further period of treatment, the patient could undergo debridement surgery.