An electrostatic forming membrane reflector with AstroMesh structural support is a new concept for space-borne deployable antennas. A membrane shape-control optimization model is proposed in this study for electrode design to achieve high reflector precision. In thismodel, the electrode number, channel number, and voltages are considered design variables, the membrane reflector precision is an objectivefunction, and the positivity and uniformity of membrane stress are constraints. A technology that combines a gradient method andgenetic algorithm is proposed to solve the optimization model. This technology includes continuous and discrete design variables withdifferent values and dimensions. The validity and effectiveness of the optimization model are demonstrated via the numerical example ofa 5 m membrane reflector and a 0.55 m experimental prototype.