The product adopts the composite spinning process, which is made of two components: PTT and PET or PBT and PET as raw materials. The two-component fibers are produced through twin-screw melting and spinneret aggregation. Due to the shrinkage of the two different raw materials, the fiber produced has self-curling effect, with high elastic retraction rate, no aging, and the fabrics made of it are featured in good air permeability, strong anti-staining property, moisture absorption and perspiration repelling.