Abstract: The influence of raw materials and weaving processing on the elasticity of PTT/wool fabric was investigated through experiments.The order of elasticity of different materials is as follows:wool and PTT/PET filament sirofil >wool/PTT filament sirofil fabric > the fabric interwoven with wool/PTT and PTT filament > PTT/wool blended fabric;varying boiling process,raising the boiling temperature,and increasing overfeed in heat setting all facilitate the elasticity improvement of the fabric.The relation equation between the structure parameters and the elastic elongation of PTT/wool blended fabric was established using multivariate linear regression method.The result shows that the loom warp tightness is the most important factor on elastic elongation,and followed by float,and finally,loom weft tightness.