Vibration performance is an important index to evaluate the environmental reliability and performance stability of high-precision helicopter-borne fiber-optic gyroscopes.As the source component of helicopter-borne fiber-optic inertial navigation, the fiber source needs to ensure its stable output under vibration conditions.Aiming at the problem of the mean wavelength of the fiber source changing with vibration, based on the basic mechanism, the Jones matrix model of the optical path is established to deeply study the relationship between the polarization state of the transmitted light in the fiber and the polarization-dependent loss.Without increasing the complexity of the fiber source system, a vibration-resistant fiber source for helicopter-borne fiber-optic inertial navigation based on Faraday rotating mirror is proposed, and its performance on vibration resistance is verified through experiments.The experimental results show that the proposed scheme can improve the stability of the fiber source and fiber-optic inertial navigation under vibration conditions to a great extent.Especially under the conditions of high-frequency vibration (1000～2000 Hz), the mean wavelength stability of the fiber source is improved by 6.8×10-6.