With the deepening of MBD(Model Based Definition) technology applications in the field of three-dimensional CAD, MBD Part Design Model(Three-Dimensional Part Model designed with definition of MBD) has been the only data source of the three-dimensional machining process planning and provides a complete manufacturing information for the design process in process planning. Manufacturing feature recognition is the core technology of Three-Dimensional machining process planning and the prerequisites of process planning activities. And its data mainly comes from the Geometric information and Non-geometric information(MBD Data)of MBD Part Model. This paper focuses on the pivotal technic and difficulty of MBD Data's extraction of CATIA Three-Dimensional Model which is commonly used in auto and aviation field, describing how to apply CAA secondary development technology in depth, extracting MBD Data and useing it to feature recognition technic of three-dimensional machining process planning system, guaranteeing the following machining process planning.