Fabric non-iron pleat plasticity is a shaping element of garment. In order to better grasp the performance, its quantitative evaluation method was designed in the paper. It was believed that fabric non-iron pleat plasticity was actually the crease retention of fabric, therefore, crease retention ratio was used for characterizing the fabric non-iron pleat plasticity. The results showed that, all of "PTT shape memory fabrics", PET imitation memory fabrics and cotton fabrics had higher crease retention ratios; followed by Nylon fabrics, next was silk fabrics; wool fabrics had the smallest crease retention ratios. The results proved that crease retention ratios of different kinds of fabrics differ substantially, and the index could basically reflect the non-iron pleat plasticity of different kinds of fabrics.