Aiming to the problems of slow modulation speed, high loss, and large package size of traditional electro-optic modulators, an electro-optic modulator based on oscillating microring is proposed by using high electro-optic coefficient polymer materials and the theory of slit waveguide. The key performance of the modulator is analyzed by using COMSOL Multiphysics and Lumerical FDTD solutions simulation software. The analysis results show that the electro-optic modulator has excellent photoelectric performance under the condition of small package size and is compatible with complementary metal oxide semiconductor(CMOS) standard manufacturing process.