Understanding of the processes of detrital input to a lake is of great importance to investigate climatic and environmental changes in a region. The Gonghe Basin is located in the northeastern Qinghai-Tibetan Plateau, which is influenced climatically by both the Asian monsoon and the Westerlies. This area is crucial for understanding the climatic linkages between high latitudes and low latitudes in the Northern Hemisphere. Genggahai Lake (360ll'N, 100°06'E),a small, shallow lake, is situated in the central of Gonghe Basin. Its water surface area is about 2km~2, and the maximum water depth is about 1. 8m. The simple hydrologic pattern and abundant biodiversity make it sensitive to the changing global climate system, and hence an ideal site to study environmental changes. Cores GGH-A (782cm in length; 36°11.42'N, 100°06. 23'E) and GGH-C (774cm in length;36°11. 46'N, 100°06. 27'E) were recovered at the water depth of 170cm in central Genggahai Lake. 12 samples of aquatic macrophyte remains were selected from core GGH-A for accelerator mass spectrometer (AMS) ~(14)C dating. By comparing the varations of lithostratigraphical units and carbonate (Ca) content between cores GGH-A and GGH-C, we created an age-depth model of GGH-C. The age at the base of core GGH-C was 15. 6cal.ka B.P. Chemical elements of core GGH-C were measured using high-resolution X-Ray Fluorescence (XRF) scanning. The abundances of Si,Al,K,Ti,Fe and Rb in sediments can be used as proxies for inputs of detrital material to the lake. Combined with the variability of sand fraction (>63mum) in core GGH-A, we reconstructed changes in input processes of detrital material to Genggahai Lake and climatic changes in the study area since the Late Glacial. During the Late Glacial, the sediments was characterized by coarse median size and low content of Si, which indicated that a cold and arid climate prevailed. The input process of detritus was generally weak, and detrital material may have been transported mainly by winds. During the Early to Middle Holocene,the content of Si increased sharply, while the content of sand fraction decreased. The warmer and wetter climate was prevalent and may had been characterized by a remarkable increase in weathering process. The input of detritus to the lake increased abruptly, as a result of enhanced regional precipitation. During the Late Holocene, the content of Si increased sharply at 6. 3 ~6. 1 cal.ka B.P.,5. 6 ~ 5. 2cal.ka B.P., 4. 8 ~ 3. 9cal.ka B.P., 3. 7 ~2. 8cal.ka B.P.,2. 3 ~ 1. 8cal.ka B.P. and 0. 3 ~Ocal.ka B.P., which was in accord with the sand fraction generally, reflecting that detrital materials were episodically transported to the lake by winds and episodic aeolian activity occurred on centennial to millennial timescales. The input processes of detrital materials to Genggahai Lake appear to change in response to the changing atmospheric circulation patterns over the northeastern Qinghai-Tibetan Plateau. The increasing weathering and detrital input to the lake,owing to warmer and wetter climatic conditions during the Early to Middle Holocene,may be a response to the strengthened Asian summer monsoon at that time. In contrast, the abrupt, intense sand deposition events are likely to be associated with strong wind regimes, in response to the cold events in the North Atlantic Ocean. Our results suggest that the interaction of Asian monsoon and cold air masses from high latitudes (or the Westerlies) perhaps plays an important role in climatic changes in the marginal zones of regions dominated by the Asian summer monsoon.