In the course of overall continuous warming during the last deglaciation,the global climate has experienced a series of millennial-and centennial-scale abrupt events characterized by rapid warming or cooling. Because of the obvious high frequency characteristics of these abrupt events,more high-resolution palaeoclimate studies in different regions around the world are needed for comparison and mechanism discussion of these events. Western Yunnan Province is located to the southeastern margin of the Qinghai-Tibetan Plateau,which is topographically complex with many mountain ranges running roughly north to south and separated by parallel, deep and narrowly incised river valleys. The span of latitude and altitude differences are large, and the elevation of the region ranges from about 1000 m to above 5000 m. Qinghai Lake, Tiancai Lake and Lugu Lake are all located in western Yunnan Province (the west of 101° E). Their altitudes are 1885 m,3898 m and 2690 m,respectively. This paper compared synthetically the pollen and charcoal records between ca. 20 ka and 10 ka from the sediment cores of these three lakes, and discussed the history of vegetation evolution and climatic changes, and explored the possible climatic abrupt events during the last deglacial period. The data include 114 pollen and charcoal samples from Qinghai Lake, 110 pollen samples from Tiancai Lake, and 122 pollen samples from Lugu Lake during the last deglacial period. The results show that the initial Late Glacial warming in western Yunnan Province occurred at ca. 19. 0ka (1 ka= 1000 cal. a B.P.). After the initial Late Glacial warming, there are several climatic abrupt events in western Yunnan Province, namely, a cold and dry climatic condition during the period 17. 5 0. 5 ~15. 2 0. 1 ka, a gradually warming and humidifying climatic condition between 15. 20. 1 and 14. 30. 1 ka,an obviously warmer and wetter climatic condition from 14. 30. 1 ka to 12. 90. 1 ka,and then a slight decrease in temperature and humidity during the period 12.90. 1 ~11.70.2ka. These climatic abrupt events correspond to the Heinrich Event 1 ( H1 ), the pre-Bolling warming, the Bolling-Allerod warm period ( B/A) and the Younger Dryas event (YD),respectively. In western Yunnan Province, the start of the Holocene is relatively consistently recorded at 11. 70. 2 ka. In addition, there may be a short period with relatively obviously warm and wet climatic condition in western Yunnan Province during the period ca. 17. 7 ~17. Oka. Based on this study, we discussed forcing mechanism of climatic changes during the last deglaciation,and considered that the initial Late Glacial warming and the tendency of gradual increase of temperature may be controlled by summer solar insolation, which increased gradually from ca. 20 ka, and then peaked at ca. 11 ka. The climatic abrupt events during the last deglaciation such as the H1, the pre-Bolling warming, the B/A and the YD were mainly influenced by the Atlantic meridional overturning circulation( AMOC). At the same time, the variations in greenhouse gas concentrations also play an important modulation role.