Abstract: In order to improve the performance of the FOG, the suitable fiber coil were chosen through the fiber coil strain distribution measurement. In this article, the impact of fiber coil non-reciprocal on the gyro output which generated by strain were studied. Based on the analysis, the strain of fiber coil was tested and the appropriate samples for FOG were selected using the fiber strain analyzer to assemble and install the selected fiber coil for bias experiment. The results show that, strain tests are effectively carried out and the appropriate samples were selected using the strain analyzer. Performance of FOG has been significantly improved with the measurement and select of fiber coil strain distribution, bias stability over the full temperature range is up to 0.08 ()/h, which has important guiding significance for the development of high precision FOG.