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GNSS ionospheric correction models for single frequency user are realized through the combination of the information of long term variation from available background ionospheric model and the real-time information from GNSS measurements.Method ofionospheric model driven by GNSS data and models for the driven factor are cores for the GNSS ionospheric model.A factor of Equivalent Irradiation (ER) is introduced for ionospheric model driven method,anda new model of the factor for prediction is put forward based on its temporal and spatial variations,including a linear term and a periodic term.Analysis shows that the relative accuracy of more than 70% could be achieved for GNSS ionospheric model based on the new driven factor model,better than that of GALILEO realization which based on a three-coefficient factor model.The driven factor model in GALILEO is a specific realization of the new model when a simplification is used.