Abstract: In order to acquire an understanding of the effect of 3-D crimped PTT/PET component yarn and fabric parameters on the tensile strength of the fabric. 33 types of fabrics were woven by varying the proportion of PTT/PET bi-component filament, twists, density and textile weave, and the tensile strength of these fabrics was tested. It was found that PTT/PET bi-component filament fabrics have high breaking elongation but low tensile strength, and exhibit high elongation under low load. Under the same condition, increasing the content of PTT/PET filament in the weft decrease the tensile strength but increases the breaking elongation. Weft density mainly affects the tensile strength orther than breaking elongation. The twist of PTT/PET filament has significant effect on the tensile property of the fabric under low load, but it varies with textile weave.