The examination of diabetic foot needs to be combined with neurological examination and peripheral vascular examination to make a comprehensive judgment, as follows: 1, neurological examination: including tactile sensation such as nylon wire examination method, and temperature sensation such as infrared skin thermometer; 2, peripheral vascular examination: if the pulsation of dorsal foot artery or posterior tibial artery is palpated, and the pulsation of artery disappears, it indicates large vessel lesion; the blood pressure ratio of ankle artery to brachial artery The blood pressure ratio between the ankle artery and brachial artery can reflect the occlusion of lower limb arteries; color Doppler examination of limb vessels can understand the arterial vascular structure and function; angiography can be used to understand the degree and location of lower limb arterial occlusion. 3, diabetic foot ulcer co-infection examination: local examination can be performed, including redness, swelling, pain and tenderness, but these signs are not obvious or even missing; special examination can also be performed, such as X-ray plain film, MRI, bone 4, Charcot’s arthropathy examination: Charcot’s joint is a typical neuropathic diabetic foot deformity, and X-ray examination can reveal signs of fracture, and arch collapse and joint deformity can occur.