Multi-spectral true color synthesized images have the prospects of broad application in the interpretation of remote sensing image, target recognition and information processing etc. The technique of true color synthesis depends on the accuracy of the obtained tristimulus values CIE-XYZ, which is used to establish the right relationship between the system of camera′s RGB and human being′s visual color. So, a method of true color image synthesis based on the information of artificial target was proposed by laying the man-made targets when the satellite passes. And, the transformation matrix between camera′s RGB trichromatic system and human being′s visual color system was estimated from the reflectance spectrum of man-made targets. Eventually, the suitable true color correction model was established in the certain atmospheric conditions. Experiment of true color correction was conducted on the multi-spectral images of GF-1 satellite, and the results show that good color correction effects has been exhibited on even every image with different degrees of color′s richness.