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Based on the compound index (CI) for meteorological droughts, using the Regional Dynamic Index (RDI) for meteorological droughts constructed from the classification of droughts，the application of RDI in the operational service is analyzed. Results indicate that the occurrence and development of droughts can be monitored and evaluated dynamically by using RDI. The index responds to the cumulative effects of droughts sufficiently, with the intensity evaluation of a drought not depended on the time period defined artificially. With characteristics of dynamic, consecutive and exercisable, the index is more applicable in depicting regional droughts in service practice, such as realtime monitoring, disaster warning, course evaluating, return period estimation, history rank judgment and so on. The application test of RDI to the 2009/2010 extreme drought event occurred in Yunnan Province indicates that the practical effect is better than that by using the classification of drought.