To adapt the model in reconfiguring fault diagnosing to dynamic environment and the needs of solving the tasks of complex system fully,the paper introduced multi-Agent and related technology to the complicated fault diagnosis,an integrated intelligent control system is studied in this paper.Based on the thought of the structure of diagnostic decision and hierarchy in modeling,based on multi-layer decomposition strategy of diagnosis task,a multi-agent synchronous diagnosis federation integrated different knowledge expression modes and inference mechanisms are presented,the functions of management agent,diagnosis agent and decision agent are analyzed,the organization and evolution of agents in the system are proposed,and the corresponding conflict resolution algorithm in given,Layered structure of abstract agent with public attributes is build.System architecture is realized based on MAS distributed layered blackboard.The real world application shows that the proposed control structure successfully solves the fault diagnose problem of the complex plant,and the special advantage in the distributed domain.