Abstract:In the age of large power data,large data has become the basis for power companies to make decisions. But the simple accumulation of data can't bring benefits to the grid companies,so making full use of these actual data based on the grid, carrying on the thorough analysis,finding the implied information and using them to guide the power companies to make the right decision - making is of great significance. The application scenario of data mining in smart grid is put forward,and the data mining technology is applied to power load forecasting to study the method of applying the data mining technology to smart grid.