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In accordance with the deficiency of insulation monitoring contents for DC power system, the method of the on-line insulation inspection is proposed based on combined bridge. With STM32 as the processing core, the hardware framework and the software framework are designed and the on-line insulation monitoring devices is developed. On the basis of satisfying the system grounding and the insulation dropping, the much functions are realized, such as, AC injection, DC crosstalk, capacitance measurement, insulation early warning, DC bus to ground voltage compensation and devices self-checking. The practical application shows that this devices is accurate and reliable.