Abstract: A low cost calibration method for fiber optic gyroscope (FOG) strapdown inertial navigation system (SINS) by single axis table was studied with the system installed in a hexahedron. There are three empty surfaces without FOG in the hexahedron, so angle between three surfaces was measured by nonius protractor. A body reference frame was established according to the three surfaces, and the output model of FOG was given. During the calibration, three surfaces of the hexahedron were put on the surface of single axis table in turn. Calculation formula of FOGs scale factor and mounting misalignment was deduced. The accuracy of the calibration was discussed, and test experiment was done. The result shows the system requirement is met.