Security and stability control system(SSC) is the second defense line to ensure the safe and stable operation of the power system, on-site standardized testing of security and stability control equipment is an important means to ensure the safe and stable operation of the power grid. In order to solve the problems such as the single debugging method of SSC system, the insufficient function of the testing equipment, the existing open-loop testing methods can’t simulate the complex fault timing and the low degree of automation and so on. In this paper, the on-site standardized testing scheme of SSC system is put forward, the key technologies such as information exchange, standardized interface and platform realization technology in the on-site test system of SSC system are studied, and the standardized testing system of SSC system is developed, a multi-protocol intelligent detection terminal(MPIDT) is developed. Based on the actual project, a verification platform is built based on the RTDS real-time simulation system. The effectiveness of the proposed method is proved by experiments, and the comprehensive standardized detection of SSC system is realized conveniently and quickly.