Active polarization imaging technology has recently become the hot research field all over the world, which has great
potential application value in the military and civil area. By introducing active light source, the Mueller matrix of the
target can be calculated according to the incident light and the emitted or reflected light. Compared with conventional
direct detection technology, optical heterodyne detection technology have higher receiving sensitivities, which can
obtain the whole amplitude, frequency and phase information of the signal light. In this paper, an active polarization
imaging system will be designed. Based on optical heterodyne balanced receiver, the system can acquire the horizontal
and vertical polarization of reflected optical field simultaneously, which contain the polarization characteristic of the
target. Besides, signal to noise ratio and imaging distance can be greatly improved.