The feature part model established by using this thinking has the following characteristics：
(1) the integrated feature modeling system provides a product model with complete information with a few, features and common sense for each link of cheap application, which provides an end basis for the integration of CAD, CAPP and CAM application modules.
(2) Compared with a few modeling software, feature-based modeling provides a more natural and convenient way to express the planner’s intention, allowing the planner to directly describe parts in engineering terms.
(3) The multi-level product model of information description not only has high-level feature parameters and feature connections, but also has several low-level topological elements. On the one hand, it provides high-level semantic information for subsequent feature reviews, on the other hand, it provides basis entities for the marking of normative and precision features.
