The mechanical properties and strain at applied loads for PET/PTT (polyester/poly trimethylene terephthalate)/rayon staple blended fabrics, PET/rayon blended fabrics, and PET/rayon containing PU fabrics were studied. The result of the research shows that PET/PTT/rayon staple blended fabrics have higher bending and shear properties than other fabrics in cases regarding the weft direction. Elastic recovery above a 30% strain of PET/PTT/rayon staple blended fabrics is larger than that of other fabrics. PET/PTT/rayon staple blended fabrics are easily extensible at the small as well as the large deformation region.