The Oligocene is characterized by gradually global cooling and represents an early “icehouse” epoch during the Cenozoic. The plant fossils, as the record of geological time, can reflect the climate change of continents at that period. In this study, the Mean Annual Temperatures (MATs) of five Oligocene floras in China were reconstructed using Coexistence Approach (CA) and the MATs of four floras with no less than 15 woody dicotyledonous taxa were analyzed using Leaf Margin Analysis (LMA). Estimated MATs were consistent with the palaeoclimate indicated by the taxa of these palaeofloras. LMA gives consistently lower MAT predictions than these of CA, while MATs derived from the East Asian LMA model are consistently higher than that derived from the Chinese LMA model. Through analysis of the factors affecting the results of two methods, CAbased MAT can better represent the annual temperatures at fossil locations then, with 133~156 ℃ for the palaeoflora of the lower member of the Xianshuihe Formation, 121~194 ℃ for the palaeoflora of the Daqiao member of the Yangliantun Formation, 143~168 ℃ for the Sanhe palaeoflora, 197~237 ℃ for the Jinggu palaeoflora and 220~236 ℃ for the Ningming palaeoflora, respectively. Due to the fact that the annul temperatures restored using CA were higher than present ones, it can be inferred that global temperatures have been relatively lower since the Oligocene, but warmer than that today.