BACKGROUND:: Accurately describing the proximal femur morphology is very critical to the design and implantation of prosthesis. OBJECTIVE:: Based on reverse engineering, this paper tried to analyze the error generated when the proximal femoral morphological parameters describe the morphology of the proximal femur (Proximal femoral morphological parameters Error), classify the areas generating proximal femoral morphological parameters error, and give suggestions for improvement. METHODS:: Mimics and Imageware were used to measure the morphological parameters of a 25-year-old femaleʼs healthy hip to establish a model based on the parameters reversely. The commands “Curve-Cloud Difference” and “Surface to Cloud Difference” were used to analyze the proximal femoral morphological parameters error. RESULTS AND CONCLUSION:: The overall proximal femoral morphological parameters error of this female femoral was (1.29±0.99) mm. Among the error, the out surface of the femoral shaftʼs matching error accounted for 70.43%, medullary cavity accounted for 21.46%, and the femoral head only accounted for 8.11%. The proximal femoral morphological parameters error existed in the following areas: the femoral head was not standard sphere; the intersecting curves between the five planes near the small rotor and the cortical bone surface was not simply circle or ellipse with same axis directions; the measurement of the small rotorʼs geometrical characteristics was also neglected. Improvements are as follows: researchers should measure both the length of the axes and the angle between the axes and the anteroposterior plane; researchers should also take more attention in measuring the geometrical characteristics of the rotor.