In recent years,we have reconstructed five independently dated compound specific hydrogen isotope records of sedimentary leaf waxes at different time scales from lakes on the Tibetan Plateau,Qinghai Lake (37°01'N,100°12'E),Lingge Co(33°51'N,88°35'E),Dagze Co(31°50'N,87°30'E),Bangong Co(33°42'N,78°41'E)and Aweng Co(32°42'N,81 °38'E).This study summarized the above records,and combined these records with existing isotopic and hydrological data to investigate variations in the influence of the summer monsoon and the westerly jet on the moisture budget of the Tibetan Plateau during the Holocene.The results show that:(1) deltaD values of precipitation at the above lakes were relatively negative,suggesting the influence of summer monsoon,indicating that the summer monsoon can affect most parts of the Tibetan Plateau.During the early Holocene the boundary of the summer monsoon located between Lake Qinghai and Lake Hurleg.(2) During the Middle Holocene deltaD values of precipitation at Qinghai Lake,Bangong Co and Aweng Co were gradually positive,indicating the weakening of the summer monsoon.However,during 7.0~4.5 ka,periods of more positive deltaD values of precipitation correspond to wetter intervals inferred from lake level high stands at Linggo Co in the northern Tibetan Plateau and likely reflect variations in moisture associated with the westerly jet.(3) During the Late Holocene,the positive deltaD values of precipitation at Qinghai Lake and Bangong Co suggesting the continuing weakening of the summer monsoon.The depleted deltaD values of precipitation at Aweng Co during the Late Holocene was due to the influence of the melt water as a result of the increased temperature.The positive deltaD values of precipitation at Lingge Co correspond to high lake levels indicating the influence of Westerlies during 3.5 ~1.7 ka.Precipitation isotope ratios tended to be lower between 2.0 ~1.0 ka,implying a cool and humid climate and reflecting the influence of Westerlies when the monsoon weakened.(4) Collectively,the hydrogen isotope records at these lakes document millennial and centennial scale variations in the strength of the summer monsoon systems and concurrent changes in the westerly jet.During the middle to Late Holocene,when the monsoon weakened,the Westerlies could have been able to penetrate into the region,supplying cold and wet precipitation.