Abstract: Preparation of plasticizer dioctyl terephthalate(DOTP) by the waste PET as raw material and tetrabutyl titanate as the catalyst in the aprotic solvent of N-methyl-2-pyrrolidinone is study. Influences of the reaction time，molar ratio，type of solvents and their volume on the yield of alcoholysis products are investigated. The results show that the initial phase is non-homogeneous reaction，solid-liquid mass transfer coefficient is the main factor on the reaction rate，N-methyl-2-pyrrolidone can accelerate the dissolution of polyester film and prompte the alcoholysis reaction into homogeneous process. Under the condition of the reaction time of 2 h，mole ratio (2-EH to PET) of 4，weight ratio (catalyst to PET) of 0.5%，and volume ratio (2-EH to NMP) of 4，the yield of DOTP is 78.10 %.