The contact damage between prostheses and limbs is caused by impact and wear,however,the current skin wear tester can not simulate the real friction between limbs and skin.Therefore,a biological limb skin impact wear comfort testing machine was developed.The testing machine is composed of limb fixation device,extrusion wear device,impact nested wear device and support platform.It can be used to simulate the motion state of friction and wear between prosthetics and limbs during extrusion wear and impact nested wear,so as to study the wear situation under complex stress conditions caused by skin and prosthesis contact.It provides the basis for the design of artificial limb and the analysis of wear condition.