Background: This study was aimed to investigate the distribution of Internal mammary artery perforator for flap design by digital subtraction angiography and metal pins on the chest before operation.Methods: 32 participants were randomly collected in observation.The distributions of the IMAPs were assessed by either selective DSA combining the metal pins on the chest as experimental group,or ultrasonic examination as control group before surgery and the anatomical data were recorded..22 were assessed using DSA while 10 ultrasound.The island flap was harvested according to the marked traces.