At present，mineral oil is commonly used in the electromagnetic unit and synthetic oil in capacitive voltage divider as insulation impregnating media for capacitive voltage transformer（CVT）. These media are mostly slightly toxic or relatively non-toxic but face a definite pressure in the production or disposal of hazardous waste such as waste oil. Under the development of green，environmentally friendly and low-carbon electricity，especially in advocating green energy and green manufacturing both at home and abroad，the environmentally friendly insulation media represented by natural ester insulation oil have great inherent advantages. In this paper，the insulation performance and dielectric loss of capacitor media impregnated with natural ester insulating oil at different temperatures is studied through comparing the commonly used impregnating agents for CVT，diarylethane and natural ester insulating oil. It is concluded that the insulation performance of capacitor media impregnated with natural ester insulating oil basically meets the withstanding voltage and dielectric loss requirements of capacitor dividers of CVT. A CVT prototype with natural ester insulating oil is produced and corresponding routine test items are performed，which provide data support for subsequent impact tests and batch test verification.