In order to guarantee the polarization accuracy of atmospheric synchronous corrector, it is necessary to test and filtrate its filters in the process of corrector development. The polarization measurement model of corrector and the filtration conditions of optical filters are designed, and the main factors which affect the polarization accuracy of corrector are analyzed. Taking the 490 nm channel as an example, using the spectral transmittance of optical filters and the spectral radiance data of typical targets, the relative transmittance between polarized channels and the changes of ratio of out-of-band response to total response with the spectral radiance shape of typical targets are analyzed, and the filtration of optical filters is performed. At last, the polarization measurement precision of the corrector is verified. The results show that the polarization accuracy of the corrector can be guaranteed when the changes of the relative transmittance between polarized channels and the changes of out-of-band response with total response are all not more than 0.4%, and the combined uncertainty is less than 0.5% in the range of atmospheric polarization 0 to 0.4. The uncertainty of a corrector with optimal selection filter is obviously smaller than that of a corrector without optimal selection filter, which proves the effectiveness of the filtration method.