Abstract: The Hanjiang River is located in a region between the temperate and subtropical zones, and it is sensitive to environmental change. The river valleys are mostly Ushaped, deep and narrow, the stream is torrential, and the storage capacity is low. Therefore, flood disasters occur frequently in the Hanjiang River Basin. As a water source of the SouthtoNorth Water Transfer Project, the negative change of precipitation and meteorological conditions in the upper reaches of the Hanjiang River will endanger the security of peopl[JP8]e’[JP]s lives and impact the local economic development, thus more and more researches focused on this field. In this paper, the LWD, QFC and TJZ Holocene sedimentary profiles in the upper reaches of the Hanjiang River were analyzed, the SWDs were dated to 1 900-1 700 a B.P. in the Eastern Han Dynasty (from 25 A. D. to 220 A. D.). Based on the statistic results of the historical data and records in the upper reaches of the Hanjiang River, the flood disasters during the period from 221 B.C. to 618 A.D. were analyzed. The conclusion was that the flood frequency was the highest in the Eastern Han Dynasty. The flood occurrence was related to the unusual climate fluctuation and the unstable weather system.

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