Abstract:Tonggusibaxi Ancient City, one of the most important earthen sites in Xinjiang, was a military stronghold of Anxi Frontier?Command in Qiuci during the Tang Dynasty. A large number of cultural relics, having great significance for studies of the cultural history and city layout in the Western Regions in the ancient times, have been unearthed from the site. As described in this paper, during an onsite survey the physical,chemical, mechanical and hydrological properties of the soil were tested in Tonggusibaxi Ancient City. In addition, the anti-erode properties of the soil were tested, after it had been reinforced concentration using potassium silicate(PS)solutions of various concentrations, under rainy and windy conditions. The experiments confirmed that PS could be used to reinforce earth sites and on-site reinforcement projects.