Due to the interference of the external complex environment on the observations of integrated navigation, the filtering accuracy may be degraded.This paper proposes a robust Kalman filter based on modified Rodrigues parameters.The proposed algorithm can suppress the disturbance of observations using modified Rodrigues parameters and Huber robust filtering strategy.In the integrated SINS/GPS navigation test, contrast is made to the filtering algorithm based on unscented quaternion estimator, the filtering algorithm based on modified Rodrigues parameters and their robust forms.The results prove that the proposed algorithm is valid with lower calculation cost and better robustness.