It is important to improve the measurement accuracy of the high voltage DC resistance divider at 1′10-5 order of magnitude. In order to reduce the leakage current along the insulating pillar surface in the high voltage DC divider, this paper studies the influence of different insulation materials and the improvement measures on the accuracy of the voltage divider. The test platform is built, which includes the 50kV divider, 100kV standard voltage divider and synchronous acquisition system. After completing the calibration test of the high precision digital multimeter, the measurement experiment of the influence of the organic glass and the polytetrafluoroethylene material on the measuring accuracy is carried out. And the effect of increasing the internal shielding resistance and filling the nitrogen in the divider on the accuracy of measuring is studied. The conclusions obtained in this paper can be used as a reference for the design of high voltage DC resistance divider with 0.005 accuracy levels.