There are many elements that must be considered in the whole process of the production and manufacture of cemented carbide rotary files. We must fully consider the performance of the rotary file and the service life of the tool. In the processing of cemented carbide rotary files, in order to further improve the service life of the tool, it is generally necessary to have a surface coating on the tool. The surface coating can not only reduce the milling performance, but also increase its service life. The surface coating of cemented carbide rotary files is generally divided into the following categories, aerobic titanium carbide coating, titanium oxide aluminide coating, silicon oxide coating and its diamond-like coating. As far as the titanium oxide aluminide coating is concerned, it belongs to the super wear-resistant and high-hard coating. This kind of cemented carbide rotary file has better oxidation resistance, wear resistance and organic chemical reliability. This kind of tool is suitable for drilling ferritic stainless steel and its stainless steel plate and other product workpieces. The silicon oxide coating is mainly suitable for the production and processing of rusty iron parts and iron castings, etc. This type of coating is a more versatile coating that can reduce the frictional resistance of the tool surface during the entire application process.