In order to evaluate the reliability of TRMM precipitation in the inland of China, this paper compared the observed precipitation and TRMM precipitation. We used three individual datasets which are (1) Xie Pingping’s grid precipitation, (2) observed precipitation on 759 gauges by the China Meteorological Administration, and (3) the 3B42_V6 version TRMM precipitation. The major results from this study: we first discovered that the TRMM precipitation was impacted by terrain, it is lighter in windward slope, and it is heavier in leeward slope and hill top; TRMM precipitation is heavier than the gauges observed precipitation in the flood season (summer and autumn) and more precisely in the Dry Season TRMM (winter and spring). Therefore, this study suggests that it should be corrected with terrain information at the time of application for the TRMM precipitation data.