As the incidence of diabetes increases year by year, diabetic foot lesions are also on the rise, with a statistically significant incidence of 2.8-14.5% in middle-aged and elderly diabetic patients. Diabetic foot gangrene is a serious disabling condition. The causes of diabetic foot pathogenesis, vascular occlusion ischemia, neuropathy and infection are important factors in its development. It is important for diabetic patients to actively prevent the occurrence of diabetic foot, so it is important for diabetic foot patients to do a good job of self-examination. Diabetic foot symptoms self-examination includes the following aspects: a. Arterial vascular examination: This is an important basis for the symptoms of diabetic foot, touch the skin of the back of the foot near the ankle with a finger, looking for the presence of dorsal foot artery pulsation and the strength of the pulsation, can be compared with the normal back of the foot artery pulsation. If the pulse is not felt or is very weak, it means that the dorsalis pedis artery has insufficient blood supply, which often indicates that there is a large artery stenosis or obstruction at the upper end of the dorsalis pedis artery, and the diabetic foot may occur at any time. Second, heavy touch: gently touch the skin of the foot with the blunt end of a large-headed needle (or sewing needle) to see if there is sensation, such as poor sensation indicates that the touch for diabetic patients to understand the grading of diabetic foot is very necessary, so as to better facilitate patients to understand their condition, so how should diabetic patients be graded? Third, light touch: cotton twisted into a tip-like, gently cross the skin of the sole of the foot, to see if they can feel, if no feeling means that the light touch disappeared or diminished. Temperature sensation: gently touch the skin of the feet with a cool metal body to check whether the skin of the feet feels cool; soak the feet in warm water from 37℃ to 37.5℃ to see if they feel warm, if they do not, it means that the temperature sensation of the feet has been significantly reduced or missing.