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In terms of the coupled mode theory, microring resonance and electro-optic modulation princeple, a reasonable project is proposed for designing an electro-optic switch with the series-coupled multiple microring resonators. The simulation and optimization are performed at the resonant wavelength of 1550 nm. The results are as follows: the core size of the microring is 1.6 m×1.6 m, the confined layer between the core and the electrode is 1.6 m, the thickness of the electrode is 0.15 m, the radius of the microring is 15.2 m, the coupling gap between the microring and the channel is 0.14 m, and the one between the microring and the microring is 0.6 m, microring number M is 4, the switching voltage is 4 V, the insertion loss is 5.4 dB, and the crosstalk is -20 dB. The output spectrum is much flatter and much steeper than that of the single microring.A key issue in the evolution of optical communication networks is the availability of flexible photonic modules to manage a variety of operations, such as signal routing, wavelength demultiplexing and switching. The electro-optic switches with shorter switching time and faster switching speed are quite appealing for signal processing in optical system [1][2][3][4] . Continuous improvement of electro-optic switches plays a very crucial role in the transmission performance of optical communication systems. In particular, the reasonable selection of electro-optic materials is one of the efficient ways to improve the performance of electro-optic switches.In the last decade, microring resonators (MRRs) have received considerable attention because of their some excellent features, such as low insertion loss, small crosstalk and easy integration of fabrication. In practical applications, the MRR filters should have the so-called box-like spectral response to reduce the need for accurate wavelength control [5] . In order to improve the Lorentzian spectral response and reduce the switching voltage of a single MRR, we can cascade multiple microrings serially to form an electro-optic series coupled MRR array.

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