In order to solve the problem of poor imaging quality of traditional imaging to target objects in complex environment background, Based on the characteristic that the polarization information of reflected light wave is different due to the difference of external texture and characteristics of different objects, In this paper, polarization imaging and image mean are combined to obtain the polarization information of the target and the background, and the mean of the degree of polarization image is processed, so as to enhance the target contour and significantly improve the contrast of the target. In the experiment, the polarizer that can rotate along the main optical axis is added to the CCD lens, and the polarization image of the target under different polarization angles under the complex background is obtained. The algorithm based on Stokes parameter is used to process the polarization image of the target. Finally, the polarization image is averaged and analyzed. After the low contrast target is processed, the results show that in the original polarization image, the contrast of target a is improved by 4.1 times, target b by 3.6 times, target c by 3.5 times, and target d by 4.3 times. The boundary and texture information of each object is greatly enhanced, and its contour can be clearly distinguished.