The DC voltage divider，also known as DC voltage transformer，is the main equipment for measuring the DC voltage in the DC transmission system. At present，the high-voltage DC voltage divider is mainly based on the principle of resistive-capacitive voltage division. In this paper，the operating principle of the DC voltage divider，the operating environment of the high voltage arm capacitor and product characteristics are introduced and the capacitor prototype is developed. It is concluded that under the same size of the capacitor core，the average field strength of the three-film two-paper dielectric structure is lower than that of the two-film one-paper dielectric structure，and the adoption of integrated end cover-expander can improve the space utilization rate. The rationality of design and manufacture is verified by the test of capacitor unit and DC voltage divider.