By taking Luodai Ancient Town in Longquanyi District of Chengdu City for example,from the perspective of geological location,historical cultural characteristic and layout,the paper had analyzed layout feature of the ancient town,and emphasized that the ancient people had paid attention to spiritual belief of geomantic omen.By taking "near the mountain and by the river" and "Yin at the back and Yang in front" as important reference,it had analyzed manifestation of geomantic omen in Luodai ancient town,and highlighted the composition feature,scientificness and practicality of "one street and seven lanes" as the traditional layout.Hakka residence and guild buildings were the most characteristic representations of Luodai ancient town.It stressed that Hakka residence was a unique architectural style forming by integrating local natural condition,national belief,and traditional construction technology;and guild building was the characteristic product of fellow townsman contact in Ming and Qing Dynasty.It has selected "WU Family House",Guangdong Guild,Jiangxi Guild and Huguang Guild to analyze architectural characteristics in ancient towns,so as to further study characteristic landscape in Luodai ancient town.