Abstract: In inertial confinement fusion(ICF) experiments, the flat response X-ray diode(XRD) array is used to detect the evolution of radiation fluxes of the hohlraum from different directions. The spectrum response of flat response XRD is not perfectly flat, which introduces uncertainty into the recovery of the radiation flux. Thus a weighting method is developed to reduce the errors caused by the spectral shapes and local oscillations of the flat response. The condition under which the recovery ratio will be improved is studied. The method has been used to analyze ICF experiment data, and the modified time history of equivalent integral temperature obtained has a good agreement with the measurements of a multi-channel soft-X-ray spectrometer.