Three- dimensional imaging tomography can be used for revealing the layer of containing fluid. In the Qinghai—Xizang(Tibet) Plateau, high resolution seismic tomography was carried out by using the data of the local stations and a three- dimensional image of the seismic wave velocity with a resolution of 0. 5°×0. 5°×10 km in the lithosphere was obtained, revealing the crust structures in and around the plateau. Combining with the density and resistivity imaging, it is found that the crustal fluid layers can be located by resulting velocity disturbance, density and resistivity images. The high velocity anomalies in the upper crust often indicate the cap layers to the fluid layers as well. Based on the images we locate several locations and their ranges of the fluid layers in the plateau. It is found that the crustal fluid layers are related spacially to the asthenosphere upwelling.