Abstract: A great number of applications of NWP (Numerical Weather Prediction) products show that, although many NWP products have a high reference value, the prediction results always have some deviations. Moreover, problems about the accuracy and predictability of the fine forecasting by numerical models still exist so far. Conducting the downscaling interpretation to the NWP product will be a hot spot in the fine forecasting research. Downscaling techniques, as a new way to fine forecasting, have become an important field for study. In this paper, the concept for downscaling techniques, the technology advantages and disadvantages of each method are outlined. Technology in the domestic and foreign research progress in the application of numerical models is summed up for reference.