Based on side-view imaging,the one-step method was proposed to achieve higher alignment efficiency in the location and alignment of polarization axes of polarization-maintaining fibers.In comparison with side-view imaging,one-step method is not necessary to rotate fibers in alignment process,for azimuth aligning can be realized by operating correlation between light-intensity profiles and the standard library of light-intensity profiles.In order to improve the alignment precision for the one-step method,the interpolation method and optimized observation method were putted forward.To test the reliability of these measures,light-intensity profiles of panda fibers of different observation surfaces were simulated by using ray-tracing method.Then the cross correlations were done among light-intensity profiles of the same observation surfaces.The sharp degree of correlation-curve peak was implemented for the estimation of alignment precision.The alignment precision among different observation position was analyzed with and without interpolation.According to the final result,with these two measures alignment precision is improved substantially and a theoretical precision better than 0.3° is achieved.