Posterior tibial artery is a direct continuation of popliteal artery, which mainly nourishes the muscles of tibia and posterior leg group. It starts from the lower edge of the hamstring muscle with an average distance of 10 1.5mm under the line connecting the medial and lateral condyles of the femur, passes through the deep surface of the soleus tendon arch, and descends between the superficial flexor and the deep flexor of the posterior leg covered by the soleus muscle. To the calf 1/3, the artery runs between the outer edge of flexor digitorum longus tendon and the inner edge of achilles tendon, and is only covered by the deep fascia of the calf. Between the medial malleolus and the calcaneal tubercle. The deep surface of the toe abductor is divided into medial plantar artery and lateral plantar artery. The part of the posterior tibial artery covered by soleus muscle is called the covered part, and the part of the lower end covered by deep fascia is called the exposed part. The average length of the trunk of the posterior tibial artery is 26 1.8mm, the covered part is 137.6mm, the exposed part is 124.8 mm, the average diameter at the origin of the artery is 3.0mm, the junction between the hidden part and the exposed part is 2.2mm, and the lower end of the exposed part is 2.3 mm.