Abstract: A kind of self-integrating capacitive divider is introduced to measure the diode load voltage on the Qiangguang-Ⅰ accelerator. The structure of the divider is given first and the static electric field of the divider is simulated by ANSYS. The calculation result shows that no significant effect is induced on the electric field between the anode board and the cathode board, when the divider is located in a small hole on the anode board. By using the square pulse voltage generator and the standard resistance divider the frequency response and the attenuation ratio of the capacitive divider are calibrated. At last the divider-measured voltage of the short-circuit load on the Qiangguang-Ⅰ accelerator is given.