Abstract: The composite flat woven preform deformation during the draping process was analyzed, and several fundamental assumptions were proposed for draping simulation. Based on the existing fishnet algorithms, a surface information based improved fishnet algorithm (SIB fishnet algorithm) was proposed. In this algorithm, geometry information of the surface such as tangent vector and normal curvature is used to determine the position of the current node. The use of the geometry information simplifies the mapping calculation and improves the computational accuracy. Surface-surface intersection algorithm needed for the SIB-fishnet algorithm was also studied in this paper. The draping simulation results of sphere and saddle surface generated by different algorithms were compared to verify the accuracy and stability of the SIB fishnet algorithm.