Abstract: The traditional nose implant is based on experience and handicraft of surgeons,which can't correspond exactly to patient's bone feature and perfectly enhance patient's appearance.This paper introduces a three-dimensional design system of digital implant.In this system,image segmentation and gray expanding were employed to reconstruct modal of nasal bone and akin from patent's CT image.3-D morphing and quantitative measurement were applied to reshape the nose,according to the patient's expectation.Through calculating the difference between original and reshaped nose,and analyzing thickness of soft tissue,3-D digital nose implant could be generated.The system enhances surgeon-patient communication and the clinical results match with the simulations.So the application of digital implant to actual clinic shows the system's efficiency and practicability.