Delay out-of-limit alarm method based on data baseline

The invention relates to a time delay out-of-limit alarm method based on a data base line in the field of network operation and maintenance and flow control, and aims to solve the problems that the transmission time of a service flow cannot be determined and an optimal transmission path cannot be provided for a time delay sensitive service due to the fact that the same service flow generates different time delays due to adoption of different transmission channels. Performing time delay historical data analysis to form a time delay index reference value, forming a time delay data base line according to the determined time delay index reference value, and setting the reference value of the time delay data base line as a time delay threshold reference range; comparing a real-time delay value in a network operation process with a corresponding value of a delay data baseline, if the real-time value is within a threshold range, determining that the time delay is normal, otherwise, triggering a delay out-of-limit al