As electricity system reform moved on, improving operation management level, operating risk pre-control is more and more important. To improve power grid enterprises' operating management level and business function performance, establishing an early-warning system in conformity with power grid enterprises' operation mode is necessary. Standing in the angle of the grid operation managers, this paper studies using system dynamics analyze power grid operation management level from business indicators interaction relationship to various business departments, and built power grid dynamic feedback relation model for early-warning of enterprise operation, and have an example analysis and the practical application, the result shows that the availability and applicability of the model.