Abstract: In order to solve the stable running problem for self-provided power plant of iron and steel enterprise under the isolated situation, after analyzing the electronic operation rules and real-time electronic data of the power plant, and combining with its electrical diagrams, a simulation model of power supply network of self-provided power plant was constructed by using power system simulation software PSASP. According to the layout, basic data acquired from the power plant were put into the model with respect to different areas, then operating conditions of the self-provided power plant connecting and isolated with grid were analyzed with the method of flow calculation,and an isolated operation control strategy was proposed. Simulation results verified the feasibility of the proposed strategy.