Abstract：This paper studied a hybrid cable-stayed bridge in Benxi and its best cable force, as well as the internal forces of the main beam, linear effects, in order to provide a reference for other similar bridges. The minimum energy constraint-based composite method was put forward on the basis of the existing cable force optimization theory. In addition, in accordance with tensile and compressive strain in the tower beam bending strain energy to establish an objective function, this paper used the display gradient mathematical expressions to solve it. The mechanical concepts is clear and simple calculation. After the optimization, the girder side maximum negative moment is 83 292.49 kN•m, the concrete side maximum negative moment is 18 934.7 kN•m, and the maximum under the main beam deflection is 40.1 mm which appears in the steel side and away from the main pier steel beam 0.75 L. In short the girder moment is reasonable, the cable force is uniform, and the linear of the bridge is good. Thus this method can obtain better optimization results and better practical reference value.