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The Vertical-mixed Runoff Model, which considers both the infiltration-excess and saturation-excess mechanism, is presented. The proposed model was tested using the hydrological and meteorological data from a semi-arid reservoir basin named Rizhao, with an area of 548 km(2). Moreover, an auto regression updating model was used for the real-time flood correction in every interval of the calculation. By considering many criteria, including runoff, flood peak, efficiency coefficient, and number of efficient floods, the results are in good agreement with the observations, and the real-time correction technology for flood hydrograph can further improve the forecast accuracy. Therefore, the Vertical-mixed Runoff Model combined with the real-time flood correction method is suitable for the semi-arid basin.