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The compressive after impact (CAI) and the post impact fatigue (PIF) properties of CFRP laminates for marine use were evaluated. The effects of water absorption on there properties were also confirmed. The materials used were plain woven CFRP laminates and multi-axial knitted CFRP laminates, molded by Vacuum Assist Resin Transfer Molding (VARTM) method. The damage evolution was evaluated based on ultrasonic C-scan and detailed cross-sectional observation. As CAI and PIF strength of Dry and Wet specimen of plain woven CFRP showed almost same values, the effect of water absorption on PIF properties was small. On the other hand, multi-axial knitted CFRP laminates showed larger effect of water absorption, since Wet specimens showed lower PIF properties than Dry ones. However, net CAI and PIF strengths of multi-axial knitted CFRP were larger than that of plain woven CFRP. As remarkable damage evolution caused by fatigue was not observed by the C-scan image in both CFRP laminates, it was shown that the difference of fracture mechanism between Dry and Wet specimens could be examined by the detailed cross-sectional observation.