The pendent drop apparatus to measure the surface tension of dimethyl carbonate (DMC)and heptane .The obtained data were correlated by Van De Waals equation. the deviation betweens the equations and the expermental results are within±1%. Then the surface tension of DMC/heptane mixtures with mole fraction of DMC from 0.1 to 0.9 was meatured at 298.15-343.15 K. The data were correlated by Redlich-Kister equation.The expermental data of surface tension can provide the basic thermal physical data and equations for the engineering application of DMC and heptane.