A core 40.92 m in length was drilled in Dalianhai, the terminal lake of the Shazhuyu River in Gonghe Basin, northeast Tibetan Plateau. The chronology of the core was established by normal and AMS ¹⁴C dating methods at 10 controlling points of lake plant relics. The oldest age of the core bottom is 14.5 cal ka BP. The clay minerals from the core were analyzed with the resolution of 20 cm/70 a. The evolutionary history of palaeoclimate and palaeoenvironment of Gonghe Basin since 14.5 cal ka BP was reconstructed mainly by clay minerals with particle fraction. During the deglaciation period (14.5～10.0 cal ka BP), the climate generally became dry and cold, with strong physical weathering. In the early-middle Holocene (10.0～5.0 cal ka BP), the climate was wet and warm, with the climatic optimum at about 6.0 cal ka BP. Chemical weathering of this period was strong. In the late Holocene (5.0～0.0 cal ka BP), the climate was similar to that of the deglaciation period, characterized by dryness and coldness and predominant physical weathering. The phases of climatic and environmental variation recorded by clay minerals were in accordance with those recorded by indices of other lakes on the plateau. The climatic and environment history of this basin shows some characteristics of Monsoon and Westerly models established since the last deglaciation period.