The study used the data from 24 rain gauge stations in the Weihe River Basin to validate the accuracy of Tropical Rainfall Measuring Mission (TRMM) 3B42 precipitation product data over the period during 2001-2012 at different sub-basins, different rain intensities and different time scales, and analyzed the differences of temporal and spatial distribution characteristics of TRMM and the observed data in the Weihe River Basin. The results show that the daily TRMM data are more sensitive to lower rainfall values than the observed rainfall values and larger differences existing for extreme values in different sub-basins. The determination coefficients are from 0.89 to 0.96 between TRMM data and the ob - served data at monthly scale. The distributions in year for the two kinds of data are similar in the Weihe River Basin, from July to early October is humid and rainy period and there are less rainfalls in other months; comparing to the northwest in the basin, there is more rainfall in the southeast for the two kinds of data.