Abstract: This paper studied the mechanical properties anal fracture morphologies of glass,carbon and carbon/glass hybrid filer reinforced PSF/WSP composites.A formula was given which can estimate or design the mechanical propertics of the hybrid composites from the properties of the single composite.Eapcrimental results showed that not only the new blend PSF/ESF can be reinforced but also a more excellent and cleaper composite may be fabricated by hynrid fibers.