Abstract: In order to track the running status of the accelerator in real time, discover potential problems in time, reduce the use of failure rate, and ensure the safety of radiotherapy patients, a linear accelerator quality management monitoring system was designed by using log files. The system adopts B/S architecture, the server is written in Python3.7 language, and is built based on Django2.2.7 framework. The system uses Python3.7 and Pylinac packages to analyze the log files of each plan, obtain the planned beam quantity, flux gamma pass rate, and position information of multi-page raster, etc., realize the quality monitoring of medical linear accelerator, and customize the development of accelerator spare parts and maintenance management modules. According to statistics, after the establishment of the quality management monitoring system, the accelerator has reduced the failure rate of about 16% and the shutdown rate of about 30%, which ensures the stable operation of the hospital accelerator.