Abstract: A direct propylene epoxidation demonstration unit with 1500t/a capacity with catalyst TS-1 has been stably running for 4 000 h. The results indicated that the hydrogen peroxide conversion and the propylene oxide selectivity is maintained at 90%~96% and 90%~92%, respectively, meeting the unit design requirement. The quality of the product PO purified by distillation is in line with the national superior grade standard. By the direct propylene epoxidation technology, the pollutions of waste materials can be solved and the energy consumption can be reduced. And the existing problems and applying prospects are also discussed.