The simulation and experimental study of hot turning nickel-based alloys were carried out. Under the conditions of large amount of flame heating and room temperature cutting,the nickel-based alloy was machined with uncoated carbide blade under the cutting speed of 66 m/min and 188 m/min,the feed speed of 0.1 mm/r and 0.15 mm/r and a constant cutting depth.The machining process at room temperature and heating was analyzed by focused on the measurement of specific cutting energy and cutting force. The hot turning process of 718 chromium-nickel-iron alloy was analyzed by finite element software. The results show that the cutting force and specific cutting energy at heating condition are lower than that at room temperature. The simulation results are consistent with the experimental results.