Abstract: The crust of Tibetan Plateau is still uplifting and thickening nowadays by the collision between the Indian plate and Eurasian plate which revealed by the results of geological and tectonic, it is also a complex and hot problem which has been studying by global geoscientists. However, almost no quantitative evidence shows whether the plateau is still uplifting or thickening. In this paper we present geodetic evidence of mass loss beneath the Tibetan Plateau and increasing crust thickness which is 3.9±0.8cm/a by using high accuracy absolute gravity data and the authoritative GPS measurements results, finally we give a simple geodynamic model illustrating crustal thickening of the Tibetan Plateau.