Based on P and S wave travel times of local, regional and far earthquakes recorded on 115 station distributed in capital area and Handan network in Hebei Province, P and S wave velocity structures beneath Taihangshan tectonic belt and areas at its east were obtained in the depth of 300km by seismic tomography technology. The results show that, there exists obviously transversal unhomogeneous in upper mantle velocity profiles along Taihangshan tectonic belt, where its southern, middle and northern segments exhibits their different structure features. Beneath the area at the east of Taihangshan, the lithosphere is thin, and the asthenosphere here is at the depth of about 80km. But under the depth of 180km, the P wave velocity structures show large differences in S wave velocity structures, in which at the east area of North China there presents mainly high P wave velocity, while S wave velocity maintains relatively low in most areas of North China basins although the low velocity media is cut by high velocity bodies. The deep structures demonstrate that, the middle segment of Taihangshan had been affected strongly by the lithospheric thinning in North China, and its velocity structure is much consistent with that beneath the basins. While the tectonic activity in southern segment was controlled apparently by shallow faults, but the upper mantle may maintain the character of old orogen with thick lithosphere and more high velocity media in upper mantle. The northern segment of Taihang belt, located at the boundary of multi-tectonic area, is complicated in velocity structure, and part low velocity region may be connected with mantle upwelling.