Nonisothermal crystallization behavior of poly(butylene adipate-co-terephthalate) (PBAT) synthesized via direct esterification and polycondensation reactions was investigated by the differential scanning calorimetry (DSC).The Avrami equation modified by Jeziorny and the Z.S.Mo equation were employed to describe the non-isothermal crystallization kinetics of copolyester samples.The test results showed that the Avrami equation was successful in describing nonisothermal crystallization process of PBAT copolyesters.PBAT copolyester could give birth to secondary crystallization.The crystallization parameter (Zc) increased with an increasing cooling rate and the Avrami exponent (n) was around 2.3.For a given cooling rate,the value of Zc demonstrated a sagging trend with an increase in adipic acid (AA) content.The equation proposed by Z.S.Mo was successful in describing the nonisothermal crystallization kinetics of PBAT copolyesters.