Abstract: Realistic imitation of appearance and patterns of fancy weaves such as mesh,mock leno,honey comb,pique stripe is a long-standing problem.The present work attempted to solve this problem.Through introduction of the concept of up and down coefficient to judge the over-lap tendency between the neighboring points and consideration of the gathering and separating forces of the long floats,the computation method of the woven fabric structure was further improved.The B-spline curve technique was used to imitate the yarn structure and the 3D image of this kind of fabrics,and better results were obtained.