Abstract: The way that adjustable light interference the imaging process of the TV seeker is to confront TV guidance weapons. Based on introducing the process of camera obtaining images, the relationship between the image grayscale and illumination condition, camera parameters was theoretically analyzed firstly. Then the influence on gain control with different light intensity ratio and irradiating area ratio was discussed, and the adjustment curve of gain with the light conditions changing was got. Finally, the experiment about how global illumination and partial illumination influent on image quality and how the illumination in accordance with certain control time order influent the imaging process of CCD camera was carried on, and the quality of interference image by using the function of structural similarity(SSIM) was evaluated. The results show that this way of interference is very efficient. The adjustable light can interfere the imaging process of CCD camera, and can make image quality reduced greatly.