Abstract: The developments of environment-friendly plasticizers of poly(vinyl chloride)，epoxidized vegetable oil and tri-butyl citrate and acetyl tri-butyl citrate，are discussed. These kinds of plasticizers are cheap and used extensively. Their preparation is discussed by contrast with the traditional catalyst and the use of new and high efficiency catalysts is emphasized. It is pointed out that environment- friendly plasticizers are the worldwide development trend and accord with sustainable development.