| In the thesis, efficiency calculation of the power plant feed pump driving steam turbine in the unit operation is mainly analyzed, concerning the variant working condition economical analysis of this turbine. Theory and calculation formulae of the turbine efficiency measuring method based on pump shaft power measuring are elucidated. According to the turbine economical analysis of different "reference point"based on "energy value method", adopting steam driven pump package can obtain higher economical efficiency. Then the turbine's extraction steam flow and the main turbine's steam increase are confirmed through the analysis of the relationship between feed pump parameters and main turbine flow rate under variant working condition. Finally the unit's economical efficiency under low load operation and the influence of steam exhaust manner to the condenser are analyzed and theoretically calculated.
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