Abstract: The spatially modulated imaging Fourier transform spectrometer(SMIFTS) is different from other spectrometers.Its interference data cube consists of one dimensional spatial information and one dimensional spectral information of land.Because of its special theory,the on-board data calibration of SMIFTS is imperfect.A method of relative radiometric calibration was introduced to generate CCD models of the detectors,which was based on statistics method,and the real on board data of HJ-1A was used to validate it.The results indicate that the method can correct the difference of CCD response and the difference of the imported light field,reduce the nonlinear offsetting of phase,and can raise the precision of spectrum reproduction.