DC protection hardware platform of Guizhou-Guangdong DC I and DC II is based on SIMADYN D system. In order to improve the efficiency of the DC protection maintenance and regular inspect, this paper develops a regular inspection system. The system meets code requirements, is easy to operate, and also has friendly interface and other characteristics. It’s running in the mainstream Window operating system, which can replace debugging tools IBS and achieve the function of DC protection systems digital, analog input channel information display and monitoring, as well as digital and analog outputs issuing, etc.