In terms of the coupled mode theory, microring resonance theory and electro-optic modulation theory, a reasonable project is proposed for designing an electro-optic polymer microring resonator switch array. This device consists of 1 horizontal channel, N vertical channels and N microrings. By applying different manners of the operation voltage on the microrings, the switching functions can be realized in the N+1 channels. Taking 1×8 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 1.7×1.7 μm2, 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 12.6 V, the insertion loss is about 0.67~1.26 dB, and the crosstalk is less than -20 dB, and the switching time is about 11.35 ps.