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Reconstruction of ancient atmospheric conditions through the analysis of precipitation patterns is a novel endeavor in the study of paleoclimate.A new approach is now available for a quantitative reconstruction of Paleogene atmospheric hydrological conditions in High Arctic.It is based on 1) the discovery of exceptionally-preserved Paleogene plant fossils from the Canadian Arctic which yielded in situ labile biomolecules;2) the development of compound -specific hydrogen isotope analysis which can be applied to small amount of plant material;and 3) taxon-specific apparent hydrogen isotope fractionation factors obtained from empirical measurement. A new moisture recycling model is established to explain the reconstructed paleohydrologic pattern in the High Arctic during Paleogene.“,”Reconstruction of ancient atmospheric conditions through the analysis of precipitation patterns is a novel endeavor in the study of paleoclimate.A new approach is now available for a quantitative reconstruction of Paleogene atmospheric hydrological conditions in High Arctic.It is based on 1) the discovery of exceptionally-preserved Paleogene plant fossils from the Canadian Arctic which yielded in situ labile biomolecules;2) the development of compound -specific hydrogen isotope analysis which can be applied to small amount of plant material;and 3) taxon-specific apparent hydrogen isotope fractionation factors obtained from empirical measurement. A new moisture recycling model is established to explain the reconstructed paleohydrologic pattern in the High Arctic during Paleogene.