The rapid and variant design of product is an important method for enterprises being responsible to market requirements, along with the market drastic competition; the business enterprise becomes a urgent need with technical design to this kind of variant design; through the variable used to restrain corresponding character on UGNX system.

Theoretical research on the optimization method of complex mechanical system based on characteristic variables;

The method of modelling and control based on characteristic variables chosen according to system output distributions is presented.

Therefore the paper presents a set of characteristic variables describing the conical magnetic bearing,which realizes the decoupling of the radial and axial forces of bearings.