To simplify the calibration equipment and lower the cost, the feasibility of calibratiing FOG strapdown inertial navigation system(SINS) through the twoaxis position turntable has studied in this paper. And the effect of the turntable position error on the calibrating results of FOG inertial measurement unit(IMU) has been analyzed. Secondly, the FOG unit error model and accelerometer unit error model have been established, and the relevant arithmetic of calibration has been derived. A new method of calibration is performed and experiments are carried out. The results of experiments show that the precision of calibration is consistent with the truevalue and the proposed method is feasible. Moreover, the maximal calibration error brought by the turntable measurement is 2.42×10-6, which is so little that can be ignored in practical application.