With the rapid development of aerospace equipment, the reliability requirements of military equipment are gradually increasing, and the reliability of the aircraft lock mechanism is crucial to the safety of aircraft take-off and landing. This paper takes aircraft cabin door lock mechanism as the research object. Firstly, a large number of cabin door lock mechanisms are investigated through literature and the characteristics and failure modes of the lock mechanism are analyzed, and the working principle of the lock mechanism is described. Secondly, the failure mechanism modeling of lock mechanism and the status quo of gradual damage of lock mechanism and the existing problems are described. The reliability research status of locking mechanism at home and abroad is analyzed. The reliability analysis of multi-link mechanism and lock mechanism are classified and combed. Finally, the research ideas of reliability analysis of locking mechanism are summarized, the existing problems and research trends of reliability analysis of complex mechanisms are also prospected.