With the vigorous development of the aerospace industry, the aviation remote sensing stabilization platform is widely used in navigation, positioning, aerial photography and other fields. The reliability of airborne remote sensing stabilization platform is easily affected by various disturbances. Therefore, a DS fusion method is proposed in this paper to evaluate the reliability of airborne three-axis stabilization platform driven by DC gear motor. Firstly, the mechanical components of the bias axis, the pitch axis, the transverse roller axis and the electronic components contained in the platform are analyzed. Then the failure rate of each component is estimated by Dempster synthesis rule. Finally, according to the reliability estimation process, the reliability level of the whole machine is estimated. The estimated results show that the reliability of the whole machine is 85%, 90%, 95% of the case, its reliable life time is 63900h, 41400h and 20200h. This method can evaluate the reliability of the three-axis stabilized platform more comprehensively and provide more reliable support for its practical application.