Pollen and age data have been collected in two cores from the Kunming basin by the project "Exploration of Active Fault and Evaluation of the Danger of the Seism in the Kunming Basin" to analyze the vegetational change and paleoclimate evolution from late MiddlePleistocene in this area. The results show that sedimentary environment has an important role in the analysis of pollen records and the paleoclimate evolution of the Kunming basin from late MiddlePleistocene: slightly cold and moderately dry (201~180 ka BP) slightly warm and moderately dry (80~132 ka BP) warm and moderately dry (132~89 ka BP) — slightly warm and moderately humid (89~75 ka BP)—warm and humid（75~38 ka BP） — slightly cold and moderately humid（38~22 ka BP）— warm and moderately dry (22~6 ka BP). Compared with the paleoclimate history of the QinghaiTibet Plateau and the global records, it is indicated that the paleoclimate evolution in the Kunming basin is in accordance with the paleoclimate in central and west of Yunnan province.