Subglacial bedrock core in Antarctic region is of great importance to the research on geologic structure and formation of Antarctic continent, no subglancial bedrock samples has been obtained in current global history, the development of rapid coring technology for subglacial bedrock in Antarctic becomes increasingly urgent. According to technological problems of subglacial bedrock coring, a conceptual design of rapid coring drill by hot water driving for subglacial bedrock in Antarctic is put forward in this paper, the ice cover on the Antarctic continent is drilled using this system with conventional hot water drilling, then replaced by hot water coring drill through the ice hole rapidly to ice rock interface in order to carry out the coring drilling of subglacial sediments and bedrock, the bedrock coring time is greatly shortened with high drilling efficiency. Based on the testing parameters of China independent researched and developed hot water drilling system, the theoretical calculation is made on the pressure loss and output torque of positive displacement motor (PDM) to provide the choice basis for PDM motor. This type of coring drill is hopeful to play an important role in future subglacail bedrock coring drilling in polar region.