The paper takes Changzhou Qingguo Historic District as an example and studies mainly three parts. Firstly, through cognitive map method, it gained the residents’ sketches about Qingguo Historic District. After summarizing the five fundamentals(district, road, boundary, landmark, panel point) relfected in the sketches and the rate of dot, string and space, it showed that Qingguo Historic District’s space perception development period is now in the growing stage; Secondly, through questionnaire method, it revealed that residents’ collective memory about Qingguo Historic District takes the present centre view as the core and shows the feature of dynamics and continuity; Thirdly, through Factor Analysis, it got that residents are more familiar with the buildings which have their own memory (subjective factor), near to downtown, residence or working place (objective factor), have been reported by newspapers, magazines or TV(intermediary). To conclude, we should promote Qingguo Historic District’s space perception development period to a mature stage and strengthen the protection of historical sites. The restoration of Qingguo Historic District’s unique appearance is needed as well.