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Fourier transform channeled spectropolarimetry is a powerful technology to get the spectrum and polarization information of the object simultaneously.Using two special retarders,the channeled spectrum was constructed in which the polarization was loaded.After that,interferogram of the channeled spectrum was obtained by Fourier transform,which could be separated into several channels.The polarization spectrum could be demodulated from those channels.However,traditional sevenchannel interferogram took up the whole detector,which means the resolution of the reconstructed spectrum drop down to one seventh of the original spectrum.