Capacitive voltage transformers（CVT） are subject to greatstray capacitance in the harmonic voltage measurement.In this paper

a kind of data mapping of input-output transfer relationship is proposed by the analysis of variation characteristics of stray capacitance and by the use of equivalent circuit of CVT so to

within the possible variation interval of stray capacitance

define the optimization combination of stray capacitance parameters in accordance with theory of mathematical statistics and with the confidence coefficient of measurement data as optimization condition and minimum corrector error as optimization target so to achieve the correction measurement method of harmonic voltage.And the reasonableness and effectiveness of the method are proved through the verification analysis of actual case.