The current polarization imaging method has the problems of poor real-time performance, low energy utilization rate and low resolution. We proposed a four-channel polarization imaging method of non-coaxial type. The method used four channels to acquire images of different polarization directions to fuse the degree of polarization image. After that, we simulated parameters such as channel spacing, channel parallelism and polarization detection angle error affecting the polarization imaging results of the system, and gave the parameter tolerance meeting the polarization imaging accuracy of 1%. Furthermore, we developed a four-channel polarization imaging system of non-coaxial type, and conducted the experiment for vehicles 50 m away outdoors. The experimental results verify that the system can effectively provide the polarization imaging for target.