Abstract:SCADA is the foundation of the power dispatching. Monitoring stuffs primarily obtain status information from this system, such as grid running state. With the increasing of the scale of the power grid, the amount of status information increases. For lacking of effective analysis methods, the monitoring stuffs are under pressure, which is disadvantageous to handling abnormal signals and accidents. By using large data analysis tool ,this paper discusses the relationship between the oil temperature and the load rate, and give the function of the main oil temperature and the load rate. Meantime, the oil temperature threshold of heavy overload is obtained. This paper also constructed a load model of 10kv distribution line. Combined with the 15-minute load data of the 10kV line, the running status of the distribution line is quickly judged and an early warning will be given. Based on weather and other data, the model of transformer load has been established. This will lay a solid foundation for analyzing and identifying potential risks in grid running, and for guiding a scientific planning of power grid.