There are many alarm signals triggered by faults in power grid． Especially in the case of power grid accidents，a large number of monitoring information will be triggered in a short period of time． It is difficult for supervisors to quickly identify the corresponding events in a short time． There is a huge amount of information in regulating and controlling the main station nationwide，and it consumes a lot of manpower and resources to analyze information events． By studying the corresponding relationship between monitoring information and events，the experiences of automatic event deduction for monitoring information are formed，and an event － based correlation analysis method is proposed for monitoring information of power grid operation based on information － event deduction logic．