Abstract: The agentmodel in amulti-agent system (MAS) environmentwith the restriction of time and resourceswas investigated, and a generalhierarchical framework of the hybrid agentwasproposed. This framework has a four-layer structure with feature declaration, mental status, computing and processing, and information interacting layers. The architecture, roles in the organization and components of the agentwere analyzed. UML (unified modeling language) technologieswere used to construct the conceptualclassdiagram of the agen.t The designmethodsof formalization expression and general agentprogram were given. The implementationmechanism of integrated scheduling engine and concurrentmessage processing was expatiated. The framework has been applied to the research of wide-area power line protection agentof theQinghai-Tibet railway, andmulti agentswere designed to implement the collaborative protection function to solve the problem of improper actions resulted from the traditional protection. The application shows that the proposed framework is effective for the complex problem.