A three-dimensional modeling method based on machining features has been proposed to enhance the correlation between model features and processing technology so as to form the modeling specification of shaft parts. By establishing two basic modeling requirements of feature independence and machining sequence modeling, process knowledge is embedded into the three-dimensional modeling process in the form of modeling specification, thus reducing the difficulty of model identification on the part of technical personnel. Finally, a three-dimensional modeling of the mechanical shafts is carried out to verify the feasibility and validity of the proposed method.