Energy forecasting is important in enterprise management, In order to solve the problems existing in the system of power energy forecasting, To use a simple grey forecasting model GM (1, 1) was simulated firstly，Through Matlab simulation software，Then according to the enterprise for the first nine months of the power consumption of data to predict three months after the power consumption of data. Draw the simulation curve. lastly，Using the improved gray model PGM (1, 1), Comparing the simulation results curve found improved prediction algorithm model has a smaller average relative error，PGM (1, 1) algorithm to overcome the GM (1, 1) grey model mutation of data in a short period of time, Make the results of the prediction model is more close to the enterprise actual power consumption data.