Abstract: Aiming at the simulation problem of three dimensional track and column braiding preforms,braiding scheme is introduced to depict the braiding mode based on the basic braiding principle.The braiding process is translated to a mathematic operation,then the movement of track and column braiding is simulated.The thread path is described by Bézier curve,thus the 3-D braiding preforms is derived using computer graphics technique.This paper brings forward a new way for braided fabric structure simulation for three dimensional track and column braiding preforms,and the complicated simulation problem is solved.Finally,simulations of regular and irregular sections of braiding preforms structures are conducted and the results prove that the method is of availability.