The research， design and test of the security and stability control system（SSC） is one of the difficult issues in a large-scale power grid. Problems related to the existing methods for development and test of the SSC in a large-scale power grid are analyzed. The SSC test and development method based on real-time simulation technology is proposed. And a real-time simulation platform based supporting framework is presented， which includes research， design， production， test， and operation analysis. Based on the real-time digital simulator（RTDS）， a real-time simulation platform for the test and development of the stability control system is built， in which a simulated environment close to reality is established and many kinds of stability control systems with multiple time scales are integrated. It can meet the test， research and development requirements of different kinds of security and stability control systems within three guard lines in a large-scale AC/DC power grid.