The operating principle and harmonic response behavior of the capacitor voltage transformer（CVT）are analyzed firstly in this paper

and the reason that the CVT is not suitable for harmonic measurement is explained. On this basis

for such several kinds of indirect measurement technologies of harmonics

which are used widely at present

as parameters identification method

end-screen test method

capacitive current method and series capacitance method

their achievement principle

the prospect and cons and application scenarios are simply described. Finally

considering that the capacitive current method decouples the interaction between the measurement results and each link of CVT in principle

it has a broad application prospect

the application of the method to realize the achievement of on line monitoring of CVT harmonics and its effect is introduced further in this paper.