Ice load acting on a icebreaking research vessel is estimated. Existing measured ice loads are used to get the global load and the local load. The global load is for analyzing the bending behavior of the vessel during ice breaking operation mode and the local load for estimating the bow structural behavior. In the paper, the global load is predicted using the data from analysis of ship motion during ice breaking. And the local load is predicted using the data from strain gage attached to bow frames.