The diagnosis of diabetic foot in Chinese medicine is mainly made by looking, smelling, asking and cutting. Looking mainly refers to observing the degree of lower limb ischemia, such as whether the sweat hair of the lower leg is lost, whether the skin is pale, and whether the nails are thickened; smelling mainly observes whether the patient has necrosis, ulceration and bad odor; asking means understanding the patient’s medical history, as well as the duration of symptoms such as pain, chills, coldness, numbness and necrosis; cutting refers to cutting the pulse, mainly referring to the dorsal foot artery and posterior tibial artery to understand the degree of lower limb ischemia and the presence of arterial pulsation. The astringent pulse indicates blockage of the main blood vessel, which then causes a series of corresponding symptoms.