Abstract: A communication information graph extraction method (CIG-EM) is proposed,which automates the CIG extraction process from the system behavior model to help system designers construct efficient on-chip communication architecture in the early stage of system design.CIG-EM adopts hierarchical contro/l data flow graph (HCDFG) as the internal representation,and presents the overall design flow from the system specification to the CIG extraction.Besides,CIG-EM introduces M-HCDFG,the extension of HCDFG,to denote the function-PE and variable-memory mapping information.The automated transformation approaches between the three models,HCDFG,M-HCDFG and CIG are also provided.The methodology can smooth the design flow and shorten the turn-around time greatly.For an experiment,this method is applied to JPEG decoder application to validate its correctness and effectiveness.