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Equipment maintenance is an important task to maintain the combat effectiveness of weapon equipment,and the establishment of scientific and reasonable maintenance strategy is the early stage of equipment maintenance. In view of complex repairable equipment maintenance strategy, analyzes and summarizes the current development of maintenance strategy, focus from threshold and inspection intervals and maintenance decision objective optimization of maintenance decision research results were reviewed in recent years, and connecting with the basis of existing research, the trend of future development of maintenance strategy optimization is discussed.