Modeling and simulation of security and stability control equipment (SSCE) are effective ways to verify its accuracy and reliability.Ongoing studies in this area has not yet been systematically carried out,so systematic research is urgently needed.This paper proposes a novel modeling scheme for SSCE based on formulaic casual analysis.According to the scheme,SSCE’s functions and action logic are systematically summed up.The entire process of modeling is divided into three parts,namely,identifying stability control strategies,stability control strategy modeling,action logic modeling.Since the action logic is composed by a series of logical relation,the casual analysis model is applied to establish model.In order to verify the correctness of the method,an engineering example is used in this paper to verify it.The result shows that the functional model of SSCE is practical and versatile and it’s easy to implement on a computer.