The Shangjialing palace site of the Qin and Han dynasties is located at Fengjiabu village of Qianyang county in Baoji. Two huge plots of rammed earth architectures have been found during this excavation, which are significant to the study of the shape and structure of pre-Qin palace system. A great quantity of pre-Qin construction materials were identified with clear stratigraphic evidence, including eaves tiles, plate tiles, imbrices, tegulae, etc.. Located along the ancient fiver course of Qianhe, the excavation of Shangjialing site not only provides important evidence for the identification of traffic routes in Guan-Long area during the Qin and Han dynasties, but also presents useful clues for arguing the locations of other palatial sites and courier stage of Qin and Han dynasties.