Since its proposal,the G-R curve has been widely used in the fields of seismology and earthquake prediction to evaluate the overall activity of regional earthquakes.Based on the above relationship,the magnitude-frequency relationship was used to classify the failure level of a certain series of CNC machine tools,the G-R relationship was embedded in MATLAB software as a whole,and an APP about the G-R curve was compiled,which was used to analyze the data collected form a series of CNC machine tools for nearly 20 years.Analysis of the failure data proved the effectiveness of the APP.