Offshore wind turbine structures are increasingly implemented but they could be largely exposed to ship collision in heavy maritime traffic area. This study aims to carry out a systematic parametric study on impact responses of the whole ship-offshore wind turbine jacket foundation system, thereby identifying the most dangerous impacting cases and vulnerable components. The three-point bending tests on DH-36 steel tubes designed by scaling jacket tubular members were performed. The effects of impact locations, collision angles and impact velocities on crashing responses, impact energy distributions and interactive deformation mechanisms were studied. Finally, the most dangerous impact cases and deformation were analyzed. It was showed that the bow impact on a leg tube resulted in the maximum local deformation of the leg and the maximum tower top displacement. The centric impact caused more severe local deformation than eccentric impact. And increasing the impact velocity from 0.5 to 3 m/s could increase the peak bending moment at the impact position of jacket leg. In the most dangerous location, the damage area and local indentation of the leg reached to 5.77 m² and 916 mm (65.4% of diameter). The study can gain important insights into the development of crashworthy offshore wind turbine structures.