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Inland river basins take about 11.4% of the land area of the world and most of them are distributed over arid regions.Understanding the hydrological cycle of inland river basin is important for water resource management in water scarcity regions.Our research focused on illustrating hydrological cycle of a typical inland river basin in China,the Heihe River Basin (HRB).First,water balance in upper,middle and lower reaches of the HRB was conceptualized by analyzing dominant hydrological processes in different parts of the river basin.Then,GBHM-SHAW and GWSiB models were used in upper reaches and middle-lower reaches respectively,to study the water cycle in the HRB.