In this study,the daily river flow of Lhasa River basin,Tibet,China is simulated using USGS Geo SFM model and the validation is made using corresponding daily gauge data from Lhasa hydrological station. The results show that the general performance of Geo SFM model in Lhasa River basin is good and reasonable. Quantitatively,the simulated discharge can explain 80% of the variability in the observed discharge. The Nash- Sutcliffe efficiency coefficient( NSCE) and correlation between the observed and simulated runoff is 0. 72 and 0. 89,respectively.Qualitatively,the general trend of the simulated and observed daily runoff is same,which presents that the both simulated and observed river flow in Lhasa River basin is low with very small inter-daily variations before Jun. After onset of raining season,the runoff of Lhasa River is increasing fast until the river discharge reaches to the highest level in later August. During this period,the variation of daily discharge is high due to daily rainfall fluctuation.Most of discharge peaks in the basin are captured by Geo SFM model,but the simulated value is less than the observed value. The highest peak of discharge in later August is also smaller than the observed value. From the end of August,along with monsoon offset and rapid decease in rainfall,the simulated and observed discharge is deceasing fast. Until early October the river discharge reaches to a relatively stable stage. However,the average simulated value is smaller than the observed value and during the raining season the inter-daily variations of simulated runoff are higher than the observed runoff. Geo SFM is a physically-based semi-distributed hydrologic model. It have few parameters and variable input data requirements to simulate the dynamics of runoff processes by using remotely sensed data such as satellite-derived rainfall products and widely available continental or global data sets.Therefore,Geo SFM is very useful in sparsely hydro-meteorological station distributed regions.