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This paper proposes the solution to design AIS in the definition and processing for both event and ECA rule. The design methods for realizing an active application system are discussed and an AIS model with DSS-PCF is given in this paper. An active information system can describe the function specifications in the application environment more availably and is capable to make the reaction actively for the different events in the application environment. The design methods mentioned in this paper are a very effective approach to develop the active information application system.