The devices in smart substation adopt embedded software and hardware platform architectures. The reliability still needs to be improved after pilot construction about new generation of smart substation. A set of test system for testing embedded platform is developed against the characteristics of embedded platform in smart substation. Based on the actual hardware and software platform, in connection with the characteristics of internal communication, this test system can customize the test cases, which can simulate the reliability of coordination and operation among various boards in the extreme situation. Simultaneously, the system can achieve automatic testing and analysis, such as task scheduling, time and memory management, interrupt and border of the software platform. This system can quickly simulate the operation state and the possible anomalies of entire life cycle, so as to ensure the stability of relevant products in smart substation. The test system has been widely used in the research and test of hardware and software platform in smart substation.