Expression device and method for fastener model in fastener aided design system

The invention provides an expression device for a fastener model in a fastener aided design system. The expression device comprises at least one fastener model, wherein the fastener model comprises an information storage module for storing three-dimensional information of the fastener model. Meanwhile, the invention provides an expression method for the fastener model in the fastener aided designsystem corresponding to the device. By storing the three-dimensional information of the fastener model in a local storage region of the fastener model and directly accessing the three-dimensional information, various graphic expressions and statistical information of the fastener model can be provided for a user for browsing and arbitrary editing, amendment or configuration. Meanwhile, according to the invention, expression illustrations of the fastener model of the device are more intuitive and easier to read by using a specific graphic expression form which is characterized by lines and circles.