Abstract: In this paper,the Faraday effect in magneto-optic glass are introduced,and the experiments are preformed on magneto-optic glass experimental sample ZF1 and ZF6 respectively.The Relationship between the azimuth rotation of the polarization plane of the linearly polarized optical beam and magnetic field strength is indicated by experiment.The Verdet constant under different magnetic field strength(the operating light wavelength is fixed all the time) is calcuated.The experimental results are quite well in agreement with the theoretical value.