The warm ice at the bottom of polar ice sheet has small brittleness, high viscoelasticity, high temperature and pressure, and poor drillability. The cutting heat generated during rotary drilling can easily cause the ice chips to be in melting or semi-melting state; as a result, the ice chips will gather together and even freeze again locally over the drilling tool, resulting in frequent accidents in the hole. In order to understand the temperature change law of cutting tools during ice rotary drilling, theoretical study is conducted on the mechanical characteristics and heat transfer law of cutting tools, and then the theoretical model for cutting tool temperature calculation under drilling fluid circulation is established. The result shows that rotation speed of the drilling bit, cutting depth, friction coefficient, cutting edge angle and ice shearing strength et al. are all have important impact on cutting temperature. Although the low-temperature drilling fluid has good cooling and cooling performance, it can still make the cutting tool temperature rise by 2 to 5℃, adversely affecting warm ice drilling. In-depth optimization should also be made for the combination of drilling parameter.