Abstract: Based on the ideas of decomposition and coordination of large systems cybernetics,a kind of architecture for SoftMan group is put forward on the basis of reference to many multi-agent systems(MAS).Key technologies such as ontology database,knowledge base,task library,communication protocols,role models and interaction models are discussed.Details from analysis to design are described,and information flow and control flow for the architecture are given by pi-calculus.Four kinds of cooperation modes of task are formally described by pi-calculus.To different application domains,corresponding application systems can be built up quickly by defining corresponding ontology database,roles and task decompositions.It provides a solution to distributed systems.