1, the definition of diabetic foot and its hazards Diabetic patients often suffer from long-term disorders of blood glucose and lipid metabolism, which can easily lead to damage to the endothelium and basement membrane of blood vessels and the formation of diabetic vascular complications. Patients with combined neuropathy and varying degrees of vasculopathy resulting in lower limb infection, ulcer formation and/or deep tissue destruction is called diabetic foot. It is highly disabling and fatal, with a high amputation rate of more than 20%, often ending in amputation and death. The time to develop diabetic foot in patients with poor blood glucose control is mostly between 5-10 years. Therefore, the prevention of foot complications in diabetic patients is the key to improving their quality of life, and measures such as controlling blood sugar, strengthening knowledge education and paying attention to foot maintenance can delay the occurrence of diabetic foot and thus improve the quality of life of diabetic patients. 2, the factors causing the onset of diabetic foot endogenous factors: various causes of poor glycemic control, causing neurovascular lesions of the lower extremities, mainly neuropathy mainly between or combined with vascular lesions. External factors: 1, foot attention is not high: foot swelling is not well treated, wearing unsuitable shoes and socks, a large number of activities due to diabetes, failure to check whether the shoe insole is suitable before wearing shoes, failure to daily self-examination of the foot. 2, improper treatment: most patients will feel cold feet, especially in winter. Often use hot water or warm water bags and electric heaters to warm the feet, resulting in skin burns. Improper nail trimming and trimming of foot calluses, failure to seek medical attention after foot ulceration, but self-treatment.