The DOLP expression of any polarizer direction was deduced based on the Stokes vector and Mueller matrix.The polarization detection experiments of camouflage target under multi-polarization directions was done,and taking camouflage man-material polarization reflection experiment as the data,the experiment results were discussed by numerical calculation,and then the influence of multi-polarization directions on the stability and error of DOLP was discussed.The experimental results show that image definition and contrast of interval 60 ° in reflection direction are high under the condition of low illumination.The numerical results can reasonably explain the experimental results and show good consistency.Research further finds that three polarization direction angles A,B,C and its intensities are a composite DOLP image,when interval angle ΦAB ∈［40°,80°］is between A and B,and average interval angle ΦAC=2.06 ΦAB is between B and C,the stability and error of DOLP image is significantly reduced.