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In order to improve the trend of abnormal data, the extra period that the revision of the 10-year interval may introduce, the consistency of the El Nino/La Nina event monitoring index and the change of the event attribute and strength caused by the change of the climate standard value which are recommended by the meteorological industry-standard (national standard), this paper constructs correlation indices based on an anomaly calculation method that can eliminate the first-order trend and discard the climate standard values. The results show that the index calculated by the scheme is in good consistency with the original method. In the series with the significant trend, the algorithm of this scheme is simpler than the meteorological industry standard recommended scheme, and the trend resolution is significant. This scheme may have promotion value in dealing with climate warming and other problems.