1895, the first electric tool in the world, DC drill, was developed by Fein company in Germany, which opened the era of human using electric tools. In the past 100 years, electric tools have grown from less to more, from primary to advanced, and now they have formed three major product series, including industry, maintenance and household, with hundreds of varieties and thousands of specifications, with an annual output of more than 8 million sets, which has become an indispensable tool for human labor. Especially in the past twenty years, with the rapid development of electronic technology, various electronic control technologies have been widely used in China's power tools, which not only improve the performance of the tools themselves, but also improve the processing quality, flexibility of use and added value of products, and push the power tools to a brand-new electromechanical integration development stage.