Auricular-prosthesis-based techniques have been developed for years to repair ears with defects.In order to obtain good aesthetics and functional effects of the auricular prosthesis,the following two steps are necessary: generate a suitable 3D model of the auricular prosthesis and implant the auricular prosthesis on the patients head.However,there may exist some problems in the current methods,generation of an auricular prosthesis might be costly,imprecise,and time-consuming.Moreover,clinical physicians usually make a preoperative surgery planning just based on their observation on the series of 2D X-ray images or CT images,which increase the uncertainty of the surgery.In consideration of the limitations in the existing techniques,we develop a computer-aided ear-repairing system to solve these problems.It mainly contains two parts: 3D reconstruction of auricular prosthesis model and preoperative surgery planning for implanting the auricular prosthesis.Firstly,the system provides an interactive technique to reconstruct a good 3D model of auricular prosthesis from the patients CT image.According to the model,a high-quality auricular prosthesis can be fabricated by the CAD/CAM technique or 3D print technique.Secondly,through this system,preoperative surgery planning of implanting can be done and the implanting result can be simulated.After the surgery planning,the surgeon can implant an auricular prosthesis on the patients skull stably and safely.Experimental results show that the proposed system can improve the accuracy,safety and intuition of the surgical planning and enhance the functional and aesthetics effects of auricular prosthesis.