The non-contact dielectric loss measurement of capacitor voltage transformer（CVT）is proposed through analysis of the dielectric loss measurement method of existing CVT. The non-contact dielectric loss platform is designed and synchronous data acquisition of voltage and current passing through the CVT is made. Then the data of electrical parameters obtained by wireless transmission module is transmitted to computer termination. The electrical parameters are processed and calculated by the use of harmonic analysis on Lab VIEW software platform and the dielectric loss（tanδ）is finally obtained. This measurement method can not only measure the dielectric loss and transient capacitance of each capacitor of CVT

but also perform electrical isolation with primary high voltage equipment effectively in the dielectric loss measurement and has higher convenience and practicability.