Abstract: In this paper,we introduce a KBS developing environment DECISION-E which has a clear and flexible abstract architecture for domain KBSs and a lot of integrated tools.The architecture enables DECISION-E to build many kinds of KBSs in a lot of real domains,and lets the KBSs fully reflect the natures of applied domains.The integrated tools help designers to build KBSs and support the KBSs problem solving and event processing phases.Techniques such as different level knowledge representation methods,multiple inference engines,interrupt inference process,global-blackboard-based distributed problem solving,knowledge-based modeling and data excerpting,and deductive database ma- nagement method,are used in DECISION-E.