A new calculation method for stream heat transfer temperature difference contribution value is proposed based on the thermodynamic principle of equal exergy loss distribution. Thereby, stream pseudo-temperature, that is, the stream effective temperature level, is determined, and composite curves are constructed on the T-H diagram, a reasonable feasible network structure is attained by vertical match in enthalpy intervals. In principle countercurrent heat exchange in network is achieved based on the stream effective temperature level, so probability of attainment of near optimum feasible solutions is high and these solutions are original feasible solutions and ordinal optimal solutions in evolution.(2) A new and effective mathematical model is presented for synthesizing MSHEN.

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