For the sake of investigating the electromagnetic susceptibility of fiber optic gyroscope (FOG), an electromagnetic interference (EMI) experiment is designed and analysis of variance (ANOVA) is utilized to evaluate the influence of electromagnetic frequencies to the export of FOG. Applying one way ANOVA, it′s found that the influence of monochromatic frequency electromagnetic signals is indistinctive. But, using two way ANOVA, the influence of sweep frequency electromagnetic signals can be seen notable, which is correlated with the move status of FOG.