The composites of thennotropic liquid crystalline copolyesters((p-hydroxy benzoic acid)一terephthalic acid-resorcin)(HB-TA-RES)and poly(butylene terephthalate)-poly(tetramethylene glycol)thermoplastic elastomer (PBT-PTMG)with different copolyester content or copolyester composition were prepared by in-situ polycondensation method．The obtained(HB—TA—RES)／PBT-PTMG were characterized by POM

TGA

WAXD

SEM and rheological analysis．Liquid crystalline behavior of the composites was observed when the HB content in copolyester was 40 mol％ and copolyester content in composite was 30 wt％～70 wt％ or copolyester content in composite was around 50 wt％and HB content in copolyester was 20 mol％～80 mol％．When the copolyester content in composites≤50 wt％or HB content in copolyester≤60 mol％

no obvious phase separation happened．The molecular structure of copolyester in composites was more homogeneous and the crystallization of HB was limited．The good thermal stability of(HB—TA—RES)／PBT-PTMG composites with thermotropic liquid crystalline behavior was obtained as compared with the corresponding homocopolyester and the viscosity of the composites was lower than that of the matrix PBT-PTMG especially when the copolyester content was more than 30 wt％．Good processability of the composite is expected in the application．