The relative radiation consistency of dual-line array images is crucial for the efficiency of in-orbit applications. This paper proposes a method that utilizes blackbody and scene information to correct the relative radiation consistency of line array images. Initially, the blackbody is used to perform a two-point correction on the two line array images to preliminarily calibrate the inconsistent responses of the pixels. Subsequently, scene-based correction is applied to one of the line array images, using the scanned image of this line array as the reference image and the scanned image of the other line array as the correction image for pixel-by-pixel fine-tuning, thereby calibrating the radiation intensity of the two line array images to the same level.