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The ALE (application level event) by EPCglobal leads the standard of RFID middleware and that represents minimal interfaces and extension points in order to independently operate it in system infrastructures. However, the extension in functions using the extension point has not standardized in the present time. Also, it demonstrated certain problems that require new codes or modifications to apply the function to the system in a system, which is being operated. This paper proposes a dynamic ALE middleware framework by introducing an AOP (aspect oriented programming) method to solve such problems and designs aspects to implement the proposed framework. The middleware framework and aspect designed in this study are able to provide dynamic functions and that solve the difficulty in the maintaining and management of the conventional ALE-based middleware according to their functional extensions. Also, it makes possible to add new functions as a standardized manner.