The offshore oil and gas production in Bohai sea is subject to the influences of ice in winter. The disasters caused by sea ice in Bohai sea were briefly reviewed. The features of Bohai sea and the ice conditions were studied. In the analysis of sea ice on marine structures based on their harmful effects, and with the help of ANSYS infinite element analysis software, the anti-ice performance of vertical structures and conical structures was compared and analyzed. The results show that the horizontal force can be reduced effectively by conical structures. The characteristics and performance of jacket platform and artificial island have been discussed. The design and promotion of anti-ice structure should be combined with environmental parameters, and the warning mechanism and emergency plan should also be established based on historical and investigation data.