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Prediction in ungauged basins (PUB) is not only a hot issue but also a challenging task in catchment hydrology.We overview the current studies regarding PUB in the international and find that its prevailing researches are about regionalization parameter, physiographical space-based interpolation and parameter extrapolation.Since it activates in China, more attentions are paid on stream flow prediction of small ungauged basins, annual runoff prediction based on annual ET estimation and hydrological model.The hydro-informatics modeling system (HIMs) is introduced lastly.Lots of studies show HIMs has a universal adaptability and remarkable flexibility, and can contribute to simulate the hydrological process with different time and space scales.