Abstract: Thermoplastic polyimide (TPI) and poly(ether ether ketone)(PEEK) were blended by mechanical method.The processability,compatibility,thermal properities,morphologies and crystallization of the blends were investigated by means of melt flow indexer,differential scanning calorimeter(DSC) and wide angle X-ray scattering(WAXD).The melt flow index of the blends was increased when the content of PEEK was decreased and melt temperature was increased.The blends were imcompatible.The crystallization temperature and the melting point of PEEK were increased with derecasing the content of TPI in the blend,but the crystallinity was reduced;likewise,the crystallization peak of XRD was more and more obvious,and the peak area was increased with decrease of the content of TPI.