Precipitation plays an important role in hydrological and energy cycle. With the global climate changes, extreme precipitation events in the worldwide are increasing frequently. Therefore,it is essential to estimate extreme precipitation events,especially in the Qinghai-Tibet Plateau. The correlation between the spatiotemporal variations of the extreme precipitation and the DMI ( Dipole Mode Index ) of NOAA ( National Oceanic and Atmospheric Administration) were analyzed by using the linear regression,Mann-Kendall,and correlation analysis methods,based on the daily precipitation data from 1973 to 2016 at 19 meteorological stations in the Yarlung Zangbo River basin. The results showed that the values of the extreme precipitation indices presented an increasing trend from 1973 to 2016,which was consistent with the trend of the average annual precipitation variation. Specifically,all of the indices including the RD ( days of precipitation ),PRCPTOT ( annual total wet-day precipitation),R95p ( very wet days),CWD ( consecutive wet days) showed the significant increasing in a confidence level of 95%,while the RD and the CWD extreme precipitation indices experienced abrupt changes around 1995,and 2001; ( 2) The spatial differences of the extreme precipitation indices were obvious,which showed a decreasing tendency from the west to the east in the Yarlung Zangbo River basin. In recent years,the heavy precipitation events may be more frequent in the eastern humid areas,which may cause more flood disasters, and the western relative arid areas became relatively humid; ( 3) The results of the principal component analysis showed that PRCPTOT and CWD explained variances of 94% and 71%,which revealed they can be used to characterize the extreme events; ( 4) DMI was significantly and positive correlated to the precipitation in the most parts of the Yarlung Zangbo River basin. The correlation coefficients between DMI and PRCPTOT were greater than 0.4,and the correlation coefficients between DMI and CWD were greater than 0.3 in parts of the central areas. There was a negative low value center in the geopotential height difference of 250 hPa and 500 hPa over Yarlung Zangbo River basin,which promoted the occurrence of extreme precipitation events. Studying extreme precipitation events and its influencing factors can provide useful information for flood control and water resources management.