| The city wall of xi'an was built from 1370 A.D. to 1378 A.D. in Ming Dynasty, which is the most complete preservation and the most large-scale among all the existing city walls in China. The appearance of Xi'an city wall has changed greatly since having experienced the break and restoration in each period. Especially after our nation was established, along with the development of the city and the city wall's defensive function disappearing, the original gates can't meet the transportation demand. So the city wall was broken continuously to get some passages, then its shape presented discontinuous. Along with the last breakup in city wall was blocked up facing the train station, the city wall of xi'an presents continuous again. The thesis regards xi'an city wall as research object, and analyzes the reason of its appearance changing on the basis of discussing the changing process of city wall's appearance at the typical developing stage of the Ming dynasty, the Qing Dynasty, Republic period and contemporary, to expect to apocalypse us when we will solve the antinomy between the city wall's protection and the old city development sometime.City wall's appearance means shape and layout of each part. City wall includes gates(gateway) , moat, Weng cheng, Yue cheng and so on;among which the gateway(including gate, city wall hole, breakup for transportation) change is the main factorinfluencing its appearance. The thesis discusses the internal and external factor influencingthe city wall appearance's changing after an analysis of the gateway's changing.Firstly the thesis discusses the research purpose and methods, and explains the concept involved in the thesis;then introduces xi'an city wall's characteristic in Ming Dynasty and its reformation simply, and sums up detailed the gateway's formation andsituation at the different stages;finally it researches deeply the factor influencing city wall appearance's changing after an analysis of the gateway's changing. |
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