This invention relates to the communication network alarm method and alarm system. The said system includes: the alarm processing unit, the system master database, and the alarm acquisition unit; thesaid alarm processing unit completes the alarm analysis; the said alarm acquisition unit includes the alarm acquisition management unit and the local storage unit, the said alarm acquisition management unit receiving the alarm data from the network element, and according to the preset masking rules to determine whether to discard the alarm data, and if not, it stores the said alarm data to the local storage unit, and sends it to the alarm processing unit; the said system master database keeps synchronization with the local storage unit, and according to the alarm processing message of the alarm processing unit, it dynamic updates the alarm data. The alarm system of the invention has a higher disaster-tolerant ability, and the system processing speed is higher, which can meet the real-timerequirements.