Abstract: Based on the analysis of TRMM data from 1998 to 2013, climatological characteristics of lightning activities, precipitation and their relationships over the Tibetan Plateau are investigated. The largest densities of lightning are over the central and northeast parts of the Plateau, with the maximum lightning density over the central Plateau reaching 6.2 fl·km^-2·a^-1. Nevertheless, the strongest precipitation occurs over the southeast part of the Plateau where the value is above 800 mm·a^-1. Both the lightning activity and precipition move westward in May and then retreat in September over the most parts of the Plateau, while the strong lightning activity over the northeast of the Plateau barely moves. Unlike the lightning activity, the precipitation shows a cascade change from southeast to northwest. In chosen specified areas, the lightning and precipitation show parallel changes, including their active periods from May to September and single peak patterns. Except for the west and southeast parts of the Plateau, the peak months of lightning and precipitation in other areas are the same. The geographic distribtuion of the rainfall per flash (RPF) is then investigated and exhibits that the minimum RPF appears over the central and west parts of the Plateau, ranging from 5×10⁷ to 7×10⁷ kg·fl^-1. The maximum RPF reaches above 1×10⁹ kg·fl^-1 over the area along the Himalayas, stretching to the southeast part of the Plateau, and over the northern Plateau near the Kunlun Mountains. Combined with the analysis of TRMM precipitation features (PFs), it is exposed that the lightning can be the proxy of deep convective activity over the plateau, while RPF can effectively represent the percentage of deep convective systems in all precipitation systems. In this way, the mid-west and northeast parts of the Plateau account for the largest percentage of deep convective activities in the whole precipitation system, while the southeast parts of the Plateau account for the smallest percentage, indicating that most of the precipitation over the southeast parts of the Plateau might be contributed by warm clouds.