This paper presents a mechanism of using complex event processing technology to process high level business logic of RFID application.By devising common high level business logic into hierarchal composite event

we automate business logic processing as event detection in RFID middleware.We first address several key issues in event definition and event detection from the perspective of RFID middleware's detection behavior.Then based on colored Petri net

we define Event Flow Detection net System as a formal modeling tool for RFID event detection behavior.We propose constructing rules for event detection model and analy ze detectability of hierarchical composite event based on characteristics of the corresponding net structure.