With the application and implementation of IEC61850 standard, it makes the smart substation periodic test technology become as intelligent as possible. The implementation scheme of the periodic test operating system for bay level equipment of the smart substation is discussed from the hardware structure and software function and its realization process, thus realizing norms and standard, and highly efficient closed-loop automatic test. Now the system has been successfully applied on the periodic test for a smart substation bay level equipment in Guizhou’s power grid. The critical problems of the development of universal test template and automatic generation of the test cases are proposed for the corresponding solution in the implementation process. The automatic test system adopts the idea of abstraction and modularization, the construction methods and design ideas are referential to other engineering practices in smart substation, such as debugging and acceptance test.