Early detection of diabetic foot requires observation of foot skin color and testing of foot sensation, etc. If the skin of the lower limbs is pale and sensation is reduced, it suggests that diabetic foot is prone to occur. Diabetic foot is related to neuropathy and vasculopathy. When the skin of the lower limbs is dry and sensation is reduced, accompanied by ant crawling sensation of the feet, it suggests that peripheral neuropathy occurs in the lower limbs; if the skin of the lower limbs is pale, the dorsal arterial pulsation of the feet is weakened, and the intermittent claudication (pain in the lower limbs after walking for a period of time, which can be relieved by resting) suggests that diabetic vasculopathy may occur. When the lower limbs have sensory loss and ischemia, it is easy to combine with the occurrence of infection, ulceration, gangrene and other conditions, that is, diabetic foot. To prevent diabetic foot, diabetic patients need to actively control their blood glucose, keep their feet clean, avoid wearing ill-fitting socks and shoes, and avoid soaking their feet in hot water. Patients with symptoms of diabetic foot or suspected diabetic foot should go to the hospital and be treated under the guidance of a doctor.