The invention discloses a baseline-based method for analyzing health state of operation, maintenance and management system. According to the method, firstly, the real-time condition of a management object index is acquired continuously and periodically based on a preset management rule. Meanwhile, the real-time condition is stored to form historical data. Secondly, the healthy running reference line of the management object index, which varies along with the time, is obtained through the quartile algorithm according to the historical data. Thirdly, with the reference line as a center, a reasonable deviation amplitude range is set according to the percentages of history data points above and below the deviation amplitude thereof. If the data of the management object index fluctuate within the reasonable deviation amplitude range, the management object index is judged to be in the normal state. Otherwise, the management object index is judged to be in the out-of-range state. Fourthly, the health trend of the operation, maintenance and management system can be judged according to the statistics on the out-of-range frequency. Finally, by utilizing the healthy running reference line extracted based on the quartile algorithm, the reference line is closer to the operation normal value of the above index. The deviation amplitude percentage and other parameters are set by users, so that the method is simple and easy to understand. Meanwhile, the judgment standard of the method is more accurate, so that the judgment is more accurate.