CNC machining technology is widely used in manufacturing and intelligent manufacturing, which makes China's demand for CNC machining center machine tools more and more high. CNC machining center machine tool is a product of high technology. When the control system fails, the processing efficiency will be seriously affected. This article is mainly for the GSK983Ma-H system CNC machining center, the daily maintenance of machine tools and the production of the system failures were explored, so as to provide reference for the corresponding machine operators.