It is necessary to detect and calibrate the device parameters to reduce errors caused by device parameter deviation during the polarization information extraction of the target. In this paper, the parameters of the Savart prism are calibrated through the beam-splitting imaging experiment on the Savart prism. In addition, a simulation is carried out on the basis of the fractional amplitude polarization camera, and the demodulation effect is quantitatively analyzed by the calculation of the structural similarity and the least square fitting method. Finally, the demodulation diagrams under different polarization states are compared by polarization imaging experiments. The influence of parameter errors on different Stokes components is analyzed, and the effectiveness of the parameter calibration method is verified.