Abstract:The traditional method of space load forecasting based on land simulation method is not perfect for all kinds of environmental factors. Moreover, for those environmental factors, the more indicators are evaluated, the more fuzzy rules are, and the more complex it is, which has been unable to meet the actual demand of electric power planning. In this paper, a new method is proposed to select the saturated load density index, which can directly consider the factors of the construction state of various actual plots. The method of "load maturity", "a load rate" and "completion rate" concept, considering the development of the city and the transformation of the uncertainty of the regional load index and regional development orientation and municipal construction progress of combined index selection is closely related to the actual situation. Accordingly, further evaluation form optimization model of the load index, the model of city land saturated load index value of iterative calculation, and correction of the abnormal load index index, finally get the most consistent with the actual development prospect forecast index of saturated load.