Abstract: On the basis of mega and microfossil records, the flora of Yunnan Province has been studied in order to reveal the Tertiary floral evolution and climatic change. Succession of the vegetation types indicates a progression from arid and subtropical climates in the Paleocene with temperatures lower than those of the late Cretaceous; humid and south subtropical climate in the Eocene with temperatures higher than those of the Paleocene; subtropical climate during the Oligocene and with temperatures lower than those of the Eocene; humid subtropical climate in the Miocene with temperatures higher than those of the Oligocene; humid, semi-humid and subtropical climates during the Pliocene with temperatures become lower than previously recorded. This tendency is consistent with Miller's analysis of Tertiary global paleoclimate change identified from oxygen isotope records in benthic and planktonic foraminifera. The CLAMP analysis and methods of floral coexistence are two comparatively new methods for quantitative reconstruction of Tertiary. terrestrial paleoclimates which rely on data from fossil plants. Using these approaches will enhance Tertiary paleoclimate analyses from Yunnan Province considerably and change the style of analysis from qualitative to quantitative.