Abstract: In order to avoid the problems of constant cross-section and interpenetration between yarns in the idealized fabric model and generate a realistic three-dimensional meso-model of two-dimensional woven fabric, a geometric deformation method based on free deformation technology was proposed. Firstly, the initial geometric model of the fabric was established through the idealized yarn centerline trajectory and cross-section, and then the free-form deformation technology was applied to deform the yarn. In the deformation process, all yarn cross-sections are free-form to deform under the constraints of spatial position and parameters. The control grid of yarn consists of the control grids after all cross sections being deformed to drive the yarn deformation, and finally a realistic fabric meso-model was generated. The contact between yarns in the deformation process was treated by ray based collision detection technique. This method can be extended and applied to other fabric structures, and can be output to other software for simulation.