The one-pot synthesis of dimethyl carbonate(DMC) with co-production of propy-lene carbonate(PC) and propy-{lene} glycol(PG) from propylene oxide(PO), carbon dioxide and methanol as the starting materials was investigated. The catalyst adopted here was a mixture of tetrabutyl ammonium bromide and sodium methoxide. It was found that under the reaction conditions of t=150 ℃, p=3—4 MPa and 2 h, the PO conversion could reach 100%, the DMC, PC and the PG selectivities were 49.7%, 42.7% and 49.8%, respectively, and the selectivity of by-products was below 10%. The one-pot synthesis of dimethyl carbonate (DMC) with co-production of propy-lene carbonate (PC) and propy- {lene} glycol (PG) from propylene oxide . The catalyst adopted was was a mixture of tetrabutyl ammonium bromide and sodium methoxide. It was found that under the reaction conditions of t = 150 ° C, p = 3-4 MPa and 2 h, the PO conversion could reach 100%, the DMC , PC and the PG selectivities were 49.7%, 42.7% and 49.8%, respectively, and the selectivity of by-products was below 10%.