Abstract: The construction of Da Chang Town started in early years of the Taikang Period of the West Jin Dynasty (3rd century).the present wellpreserved town was constructed in the Ming Dynasty (14th15th century). The wellpreserved streets（such as the East, the West and the South streets） together with the residential building, along these streets are of typical Eastern Sichuan style, which have made Da Chang a famous town in Chonqing municipality. This town is also the biggest site with wellpreserved ancient buildings in the Chonqing section of the Three Gorges Reservoir Area. In order to better preserve the cultural and historical relics of Da Chang, it has been decided after extensive consultation and thorough feasibility study to relocate the entire town. Many technological issues have therefore appeared on the agenda, particularly the identification of the new location for the town. Based on the evaluation of geological conditions and through the integration of environmental, cultural and geological features of 5 potential sites, the authors established a comprehensive assessment system providing qualitative and semiquantitative evaluation for the new site of this ancient town. The assessment system considers four aspects,including the degree of investment, feasibility of construction, possibility of reconstruction of the cultural and environmental, features and profitability of the resource use. The comprehensive assessment was achieved by weighted averaging of the individual assessment of each unit.

Key words: Da Chang ancient town, new site for location, suitability