The deterioration factors of wood which was used in the marine environment, Tongyeong (South Coast) and Incheon (West Coast) in Korea, were investigated in order to develop technologies for safe and long-term use of timber in ocean facilities. The marine microorganisms isolated by damaged wood were identified as morphological Chelura sp. and Teredo sp. As a result of DNA sequencing, it was confirmed that they were Grandidierella japonica and Teredo navalis. However, the homology of Chelura sp. was low, so it was difficult to identify by this result alone. As the combination of results between morphology and molecular analysis, it was derived as Chelura sp. and Teredo navalis. Because Korea is surrounded by three seas, it is necessary to study the protection of timber used in various fisheries facilities. For future research, various marine wood-harvesting factors will be explored

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