This paper studies experimentall the polarization characteristics of airborne polarization camera based on the large-bore integrating sphere.The relative intensity transmission coefficients of the instrument polarizers and filters in all polarized spectral channels are given based on the 0° polarizer angle channel at the center of the CCD matrix 64×64 pixels.The degree of polarization variation of optical system in airborne polarization camera is analyzed by measuring the non-polarized radiance from the integrating sphere,and a fitted polynomial function of degree of polarization relating all viewing directions within the instrument field of view is presented.The flaws of optical components and the abnormal noise of the CCD detector have little influence on the fitted function because of the statistical treatment with the whole field of view of the airborne polarization camera.Experimental study shows that the polarization characteristics for different polarized spectral channels are variant,and the airborne polarization camera often has bigger degree of polarization at larger field of view.