1. College of Earth Science, Jilin University, Changchun 130061, China;
2. State Key Laboratory of Palaeontology and Stratigraphy(Nanjing Institute of Geology and Palaenontology), Nanjing 210008, China;
3. Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China

This research systematically studies the palynoflora of the Guchengzi Formation, the main coal-bearing formation in the Donglutian Coal-Mine (East Open-Cut Coal-Mine) in Fushun Basin, and quantitatively analyzes the climate in the Early Eocene using method of coexistence approach. 71 genera and 159 species are identified in the Guchengzi Formation, in which the angiosperm pollen Momipites, Caryapollenites, Ulmipollenites and Quercoidites are abundant, gymnosperm pollen are also higher in contents with overwhelming predominance of Taxodiaceaepollenites and Inaperturopollenites; while the fern spores, Polypodiaceaesporites and Osmundacidites. The subtropical taxa are abundant and high in contents(56.3%~91.8%). The palynological assemblages show that the distribution around the basin of swamp wetland forests is characterized by Taxodiaceae which may be the important coal-forming plants, and the forest vegetation is dominated by a mixture of evergreen and deciduous broad-leaved forest in uplands of the basin. Through the coexistence approach, the average annual temperature of the Early Eocene in the Fushun Basin is 14.9℃~15.8℃ and the average annual precipitation is 1 011.3 ~ 1 163 mm. Based on the characteristics of sporopollen flora and quantitative analysis of paleoclimate parameters, the Early Eocene climate in Fushun Basin belongs to the subtropical warm and humid climate in nature.