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The concept of electro-mechanical coupling unit is proposed in this paper. As the elementary component of the system, three typical types of basic coupling units applied in hybrid electrical vehicle are analyzed including fixed-shaft transmission mechanism, planetary gear mechanism and floating-stator electrical machine. By analyzing the block diagrams and deriving the parameters relationship of practical applications, the conclusion is derived that compound electromechanical coupling system is constructed by coupling units and the total coupling effect of the system is the addition of respective units in cascade sequence. The units operate in determinate mode without interfere within each other.