The complications of diabetes, including microvascular complications or lower extremity vascular disease, take more than 5 years to occur, because the complications are closely related to the duration of the patient’s diabetes and the level of blood sugar control. When a patient has a history of diabetes for more than 5 years and has poor glycemic control, it is easy to combine diabetic peripheral neuropathy and lower extremity vascular stenosis or even occlusion, and peripheral neuropathy and lower extremity arterial disease are the basis for the development of diabetic foot. The diabetic foot is prone to occur under the combined effect of burns, infection or trauma.