The Tibetan Plateau is an ideal region for Quaternary glacier research and an excellent natural laboratory for terrestrial cosmogenic nuclides——TCN exposure dating. However, the TCN 10Be exposure ages were younger than previous research results based on other dating methods. In order to explore the reasons, we have analyzed 1594 TCN 10Be exposure ages of the Tibetan Plateau. The results suggest that: (1) 97% samples were boulders and about 93% exposure ages were less than 130 ka; (2) About 76% of the 280 boulder groups have the variation coefficient of exposure age larger than 10%. However, the cofficient for bedrock groups and roche moutonnee group are small. (3) The reasons for TCN exposure ages underestimate the morianes age can be ascribed to incomplete exposure and erosion. This study can provide an important inspiration for TCN exposure dating of glacial landforms in Tibetan Plateau.