Currently Hard machining technology has attracted worldwide manufacturing industry and research institutions attach great importance and great interest, but the promotion and application of hard cutting processing technology there are still some obstacles, the main problems are: how to make the machined surface to maintain a stable surface roughness and dimensional accuracy; machined surface quality can meet the conditions necessary parts and has a certain life span; how hard cutting machining tool selection, use, and cost control. Therefore, future research priorities Hard Cutting Mechanism and technology are: control CUTTING PROCESS size and maintain its stability; eliminate and reduce the effects of heat on the workpiece cutting dimensional accuracy; hard cutting process cooling and lubrication Research on the machined surface hardness gradient, residual stress distribution, surface morphology and the white layer formation mechanism; the rationalization of technology