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A series of biodegradable aliphatic-aromatic copolyesters,poly(butylene terephthalate-co-butylene adipate-coethylene terephthalate-co-ethylene adipate) (PBATE),were synthesized from terephthalic acid (PTA),adipic acid (AA),1,4-butanediol (BG) and ethylene glycol (EG) through direct esterification and polycondensation.The sequence structure and crystallinity of the copolyester were investigated by 1H NMR spectroscopy and the wide-angle X-ray diffractometry (WAXD).The analytical results showed that the PBATE copolyester was a random copolymer and the composition of PBATE copolyester was almost consistent with the feed molar ratios.The crystal structure of PBATE copolyester belonged to the triclinic crystalline system; The variation in melting point of the synthesized PBATE copolyester agreed well with the estimation obtained by the Flory equation and was applicable to the random copolymer.