Auto -regressive model is widely used in real -time correction of flood forecasting. In order to solve the problem ofmissing intermediate error series in continuous multi-step epitaxy correction of auto-regressive correction model, this paper proposeda sample recombination auto-regressive epitaxy method based on historical flood forecasting error series. Taking the cross-section ofWangjiaba section in the Huaihe River basin as the study area, relative flood volume error, relative flood peak error, peak lag timeand deterministic coefficient were applied to evaluate the correction effect, and compared with the time history recursive epitaxymethod. The results show that the sample recombination epitaxy method can improve the accuracy of flood forecasting and extendthe effective forecasting period, especially in reducing the flood volume error and improving the fitting precision of flood process.