Abstract: Addressing the challenge of alarm flooding faced by monitoring centers under the "unattended and centralized monitoring" mode, this paper aims to enhance fault judgment efficiency and resolve the critical issue of operator inattention. Leveraging the characteristics of the D6000 system, an intelligent alarm strategy based on multi-source information fusion is proposed. First, a visualized four-level signal hierarchical control system is constructed. Second, a signal filtering mechanism is established by employing time-domain anti-jitter logic to replace traditional thresholds. Finally, a comprehensive fault diagnosis logic for line faults and protection coordination is built based on multi-source fusion technology utilizing electrical quantities, switching values, and topology. Engineering applications demonstrate that this strategy effectively cleans raw alarm streams through logical graphs. The average daily reduction rate of invalid alarms exceeds 80%, and the diagnosis time for a single fault is shortened to within 15 seconds. This method significantly improves the alarm notification efficiency of the monitoring system, providing intuitive and efficient technical support for the safe operation of the power grid.