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Fiber Bragg Grating(FBG)strain sensors with long-distance transmission,high measurement accuracy,distributed measurement,corrosion-resistant and anti-electromagnetic interference,etc.,suitable for long-term monitoring in harsh environments,become the main direction of development of marine engineering structural health monitoring.Based on the characteristics of the marine environment and FBG strain sensor installation process requirements,the FBG strain sensor long-term sealing protection technology was in detail research.