Abstract: This paper presents a study on the power distribution control strategy of hybrid energy storage system in the isolated DC microgrid. To distribute the power of hybrid energy storage system to battery and supercapacitor according to its fluctuation frequency reasonably,an improved virtual RC droop control strategy based on inductor current is designed,and its working principle is analyzed. For the question that the droop control lead to deviation of bus voltage,the virtual RC droop control strategy based on fuzzy droop algorithm is studied on the basis of the virtual RC droop control,and the principle of self-recovery of bus voltage and supercapacitor SOC is analyzed.Finally,a hardware-in-the-loop experimental platform based on RTDS and DSP is built to verify the proposed control strategies,and the experiment results show that the fuzzy virtual RC droop control can adjust the droop coefficient in real time according to the established fuzzy rules,and its response speed is fast,but there a certain degree of voltage deviation still exists.