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In the software developing process of shipboard equipment software,there is a lack of data foundation and practical engineering practice. So this paper collected software defect information of Shipboard equipment and researched defect mode. On the basis of the defect information,the technology of equipment software dependability analysis and design is researched,such as shipbuilding equipment software credibility dependability design criteria, SFMEA and SFTA comprehensive analysis methods. Besides, we provide accessory tools and databases to enhance the software dependability of shipboard equipment.