In terms of the coupled-mode theory, microring resonance theory and electro-optic modulation theory, a structural model is proposed for designing an electro-optic polymer microring resonator switch array. This device consists of N－1 microrings and N parallel channels. By applying operation voltages in different manners on the microrings, the switching functions can be realized in the N channels. Taking 7 microrings and 8 channels as an example, the optimization and simulation are performed under the resonant wavelength of 1550 nm. The results are as follows: the core size of the microring is 1.7 μm×1.7 μm, the buffer layer thickness between the core and the electrode is 2.5 μm, the electrode thickness is 0.2 μm, the microring radius is 13.76 μm, the coupling gap between the micoring and the channel is 0.14 μm, the 3 dB bandwidth of the output spectrum is about 0.05 nm, the switching voltage is about 8.1 V, the insertion loss is about 0.23~4.6 dB, and the crosstalk is less than -20 dB.