Abstract: Taking the servo stabilization platform of two-axis and four-frame electro-optical system as the research object, the reliability of servo stabilization platform was qualitatively analyzed by using the failure mode, effects and criticality analysis (FMECA) and fuzzy analytic hierarchy process. After obtaining the critical failure modes and the list of reliability critical products of the servo stabilization platform, the fuzziness of human subjective judgment was fully considered, and the importance ranking of the impact of key products on reliability was further analyzed, which could be used as an importance reference for subsequent reliability design and distribution.