Abstract: To solve the wear failure problem existing in the hinges of the rotary mechanism in a KDIA tap-hole drill machine, a comprehensive analysis platform was established through kinematic and dynamic simulations of the mechanism and the corresponding wear depth was calculated based on a combined wear calculation model. The optimization design was conducted for slowing down the velocity and lightening the unevenness of hinge wear, using the mechanism dimensions as design variables, and no loss of other design specifications as constraints. The results show that optimizing the kinematic and dynamic performance of the mechanism through resizing the design dimensions is an effective way of solving mechanism problems such as transmission accuracy losing and wear failure.