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The Bond graph modeling theory was established by a professor of MIT named H.M.Paynter in the early of the 1960s.its main characters are modeling and simulation facing computer technology[1].Comparing with other kinds of d.vnamic modeling theories, bond graph modeling theory also has some remarkable features like:(l) the unified method is used for the complex mechanical system which coexist in different domains.(2)the dynamic features of a system are described by a simple, graphical and intuitional way.(3) the system state equations are established in a standardized way for generated by computers automatically.After all.Bond graph modeling theory is becoming the most powerful tool to deal with the complex engineering system modeling dynamical analysis.