In order to improve the precision of inertial navigation system during long time operation,the autocompensation technology was employed to suppress the divergence of errors.The auto-compensation principle of the rotated strapdown inertial navigation system(SINS) was introduced,and the effect of the optical gyro’ s scale-factor error,fixing error,bias and random drift error on the rotated compensation system was investigated.Different errors of single-and dual-axis rotation have been analyzed.The effect of the rotating auto-compensation system was analyzed by simulation.The study results offer an academic basis for optimization and design of the optical gyro rotating strapdown inertial navigation system.