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This research aims to increased toughness and flexibility of polylactic acid at a concentration of 80 percent by weight blended with 20 percent by weight of polybutylene adipate-co-terephthalate by adding plasticizer at the amount of 2 5 10 and 15 phr. The films were formed by a solvent casting process using chloroform as the solvent. The films were examined for their mechanical, thermal, melt flow index and morphology properties. It was found that the addition of plasticizers reduced glass transition temperature (Tg), cold crystallization temperature (Tcc) and melting temperature (Tm). The sample that did not contain plasticizer showed a melting temperature (Tm) of 148.52ºC but Tm decreased to 139.86ºC with addition plasticizer at 15 phr. Moreover, adding plasticizer increased melt flow rates of the polymer. The increase in plasticizer concentration improved the cross-sectional area of the film which was smooth and homogeneous. The addition of plasticizers from 2 to 10 phr increased tensile strength and elongation at break. The sample that did not have plasticizers showed elongation at break of 195% and adding 10 phr of plasticizers the elongation at break increased to 216%. However, adding plasticizers 15 phr reduced the tensile strength and elongation at break to 120%. Therefore, the amount of plasticizer 10 phr films had highest toughness and elasticity. [ABSTRACT FROM AUTHOR]