Abstract: The paper aims to reveal the variation trend and characteristics of extreme precipitation in Tibet and provide references for disaster prevention and mitigation. With daily precipitation observation data of 18 meteorological stations in Tibet during 1961-2010, the variation trends of 7 variables in Tibet Autonomous Region were investigated. The results showed that: The results showed that: the mean annual precipitation day indicated slightly increasing variation and the longest continuous precipitation day presented weak decreasing variation trend in recent 50 years while the total precipitation amount had no obvious variation. The maximum precipitation in one day and three days exhibited a slightly increasing trend. The annual precipitation, mean precipitation intensity and strong precipitation days presented a significantly increasing trend. The increase of the mean precipitation intensity and the strong precipitation days were the major reason for a remarkably increasing trend of the precipitation in Tibet. The precipitation showed a decreasing trend in western Tibet and the upper reaches of Yarlungzangbu River, where the days without rainfall increased and the dry season was much longer than before, and the desertification became more serious. The annual precipitation, the mean precipitation intensity and the strong precipitation days increased in most parts of Tibet, and the flood and waterlogging caused by the strong precipitation in short time might increase.