The past circulation pattern of the East Asian monsoon differed greatly from that of today when large-scale climate forcing and boundary conditions were enormously different form today.Lake sediments from the region have secreted the paleoenvironmental records that can be used for tracking the past monsoon changes.Most sensitive records in this respect are stored in closed-basin lakes because changes in monsoonal rainfall brought about large fluctuations in lake-level and water chemistry that are readily detectable by applying a multidisciplinary approach.Lake Qinghai is a large, closed-basin lake, lying on the outer margin of the Asian summer monsoon.The reconstruction of lake-level fluctuations and paleoenvironmental change in the past 60 ka is based on results from high-resolution seismic investigation on the subbottom sediment structures and from the multi-proxy investigation on sediment cores.