Abstract: Nonisothermal crystallization behavior of poly(butylene adipate-co-terephthalate) (PBAT) synthesized by direct esterification and polycondensation were investigated by differential scanning calorimeter (DSC). The Avrami equation modified by Jeziorny and Z.S. Mo equation were employed to describe the nonisothermal crystallization kinetics. The 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 the increase of cooling rate and the Avrami exponent (n) was around 2.3. For a given cooling rate, the value of Zc had a decrease trend with adipic acid (AA) content increasing.Z.S. Mo equation was successful in describing the nonisothermal crystallization kinetics of PBAT copolyesters.