The multichannel domescreen projection is an important information visualization technology. Projection images are prone to image distortion and bright bands are generated in the coincident region of the image. To solve these problems, an image fusion processing method based on image correction principle is proposed. Firstly, the geometric position relationship among projection images is analyzed, and the distorted image is corrected by grid division method to realize the grid position splicing and alignment of edge images. Then, the edge attenuation algorithm is used to fuse images. The shading plate device for spherical screen projection fusion is designed, which filters the overlapping light paths generated in the domescreen of multisource projection. In this way, the bright bands on the domescreen image in multisource projection can be eliminated, and the overall brightness of the projection image uniform is reserved. Finally, the edge fusion effect of the projection image is analyzed by experiments. Results show that the average peak signaltonoise ratio of five groups of images selected by the experiment is 33550 dB, which prove that this method has a good edge fusion effectiveness.