Electro-hydraulic servo CNC planer machine bending precision and positioning precision planing machine and shearing machine, has a long industrial history, as early as the late qing period, Germany has entered the industrial age. The earliest source of cutting plate machine and planer slot machine with the continent, the earliest developed two machine tools is Germany. German industrial is the best in the world, so far they manufacture of machine tools are sold to mainland China, then follow by the Chinese development, finally in the period of the republic of China, produced the Q11 series mechanical shearing machine and W67Y series four cylinder planing machine, punching and shearing and manufacturer is now the Shanghai machine tool plant. This is for the first time in our country machine tool industry technology, independent development of machine tools, thus entered the era of machines instead of human. Planing machine now has entered a new era of change, from the past in to the current hydraulic CNC hydraulic sheet, has ten years or so the evolution of the fixed number of year. But now this time, manufacturers to stop the market, it is faced with new problems and challenges. Electro-hydraulic servo system of electro-hydraulic servo system is composed of signal processing device and hydraulic power mechanism of feedback control system. Electro-hydraulic servo system combines the advantages of both electrical and hydraulic pressure, with high control precision, fast response speed, big output power, signal processing, flexible and easy to implement various parameter feedback, etc. Electro-hydraulic servo CNC planer machine, bending precision, slider high repeat positioning accuracy.