Abstract: On the basis of some existing studies, the authors study the transverse density structure of the crust and mantle beneath the DuomaDeqingDazi profile using gravityseismic integrated inversion method. The modeling results state that some lowdensity layers exist beneath most parts of profile. Two deep normal faults exist on both sides of the Nyainqentanghla Mountain and cut off the lowdensity layer. The lowdensity layer beneath Nyainqentanghla Mountain was uplifted from 5 to 10 km higher than others. Thus, the density structure beneath Nyainqentanghla Mountain like a horst. From the mountain to Duoma, the depth of Moho is basically even, but from the mountains to Dazi, namely from west to east, Moho beneath the profile is deeper and deeper. By contrast with the depth of Moho, the top of Asthenosphere beneath Nyainqentanghla is protuberant, like a anticline.

Key words: the DuomaDeqingDazi profile, character of density structure, Moho surface, asthenosphere