An accident that one offshore wind jacket foundation subjected engineering ship collision in south China sea was chosen as research case. Based on current damage assessment methods of offshore wind jacket support structure, a series of researches, residual strength analysis and fatigue analysis etc., were conducted to give an insight view of the status of impaired jacket structure. The stresses in each bar and node before and after damage to the jacket foundation, as well as the damage values of the damaged members under fatigue loading in compression and tension conditions, were obtained by calculation. The analysis outcomes in this study will provide references for further repair engineering, so as to the subsequent research and practical engineering.