Electrode plate is a key component of membrane reflector which is light enough and deployable for launching into the space for large aperture telescope. But due to complexity of the control and structure design of electrostatic membrane reflector, it is difficult to begin the trial research. In this paper, firstly, the electrode plate type about the electrodes distribution is analyzed and designed. Then, ANSYS parametric design language is used to analyze the electrostatic-structure couple field in a numerical method and by which interval distances among the electrodes is determined. Finally, prototypes of the electrode plate and the electrostatic membrane reflector are manufactured. And the following work about the control and measurement of the stretched membrane shape shows the work in this paper is feasible and effective.