Abstract: The azeotropic of dimethyl carbonate and methanol is an inseparable material. In this paper, the steady state simulation optimization of dimethyl carbonate dimethyl carbonate-methanol azeotrope was simulated by the Aspen Plus process simulation software. The optimization result is that the actual stage number of the atmospheric tower (0.1 MPa) is 25, the feeding plate position is 5, and the reflux ratio is 1.4; the actual stage number of the pressure tower (1 MPa) is 34, the feeding plate position is 27, and the reflux ratio is 1.2. The recovery rate of both dimethyl carbonate and methanol was 99.99%.