Using hourly precipitation observation data from 124 stations during the period from June to August, 2011-2012, TRMM estimated precipitation data with 0.25°×0.25° resolution, DEM elevation data, the correlation coefficient, relative error and accuracy index, the TRMM precipitation estimate ability in Tibetan and the elevation effect on precipitation estimation are analyzed. The results show that TRMM precipitation estimation trend in the plateau is consistent with larger precipitation intensity and more frequency. The average accuracy without precipitation is much higher than mean accuracy rate of precipitation, the missing rate is lower and false alarm is higher. The TRMM data have better estimate ability on the observation station with more rains. The observing sites of Tibetan are mostly located in relatively lowlying area (valley). When the elevation error between observating stations and surrounding areas is small, the precipitation error between TRMM and observation is small. On the contrary, precipitation error becomes larger when the elevation error is larger.