According to the automotive industry demand for high precision gear, by way of independent innovation, turning and hobbing gear compound machine tool overall structure,CNC system, temperature field control of high speed dry hobbing process system , hard alloy high speed dry cutting hob and other key technical problems were solved,then a high precision and high speed turning and hobbing machine tool for automobile gear was development. An open numerical control system based on motion control card was adopted in the machine tool, three methods were used to reduce the thermal error deformation of gear processing machine, three in one combination of gear processing tool was used. The whole machining process of gear was integrated in one machine,thus turning and hobbing gear and removing burr could be finished one time. Due to saving time of feeding and unloading, the production efficiency has been greatly improved, to achieve high efficiency, high precision, energy saving and environmental protection processing.