The process of DuPont's 900 t/d polyester production technology was introduced. The advantages of the production device were summarized, including reducing the area of infrastructure, saving investment costs, improving engineering stability, reducing single-line maintenance and accident losses, saving time costs, and reducing energy consumption per ton of product. The DuPont plant has improved the problems of the original plant, such as excessive entrainment, high solid content, excessive esterification reaction conditions, and poor uniformity of the melt. Through measures such as pressurizing the esterification reactor, moving the catalyst forward, and adding an online reactor on the esterification product pipeline to optimize the DuPont polyester plant, the goal of increasing production efficiency and ensuring stable production is achieved.