The pronator is the most sacrificed muscle in the forearm anterior group. Dellon et al. and Gao Zun reported the applied anatomy of pronator in 1984 and 1986 respectively. Zhong Guiwu, Kawai et al [4] reported the successful clinical application of pronator bone flap with vascular pedicle in the treatment of bone defect. Since then, relevant reports at home and abroad have appeared from time to time. This kind of muscle can be used as both a simple pedicled muscle flap and a musculoskeletal (membranous) flap. After neurolysis or neuroma resection, it can be used as a pedicle muscle flap to cover the median nerve. Used as pedicled bone graft to treat scaphoid fracture; In some cases, it is used to cover palm defects; It can also be used as functional free muscle transfer to repair thenar muscle defect. It has also been suggested that this kind of muscle flap can be applied to facial plastic surgery and so on. However, previous studies failed to clarify the distribution of intramuscular blood vessels in pronator and the anatomical basis of myocutaneous flap. In this experiment, digital anatomical techniques such as angiography and computer image analysis were used to study the forearm in detail on 7 fresh adult cadavers and 6 embalmed and fixed cadavers, in order to scientifically explore the pronator muscle as the blood supply basis of pedicled or free muscle flap, Shuang Ye flap and musculoskeletal flap.