北京城垣在北京都城建筑史上占有独特的地位。但随着朝代的更迭、外敌的入侵以及战争的爆发,使其遭受了不同程度的破坏。本文分1900年-1949年、1949 年-1976年两个时期介绍20世纪北京城垣的变迁。1949年以来,拆除城墙分两个阶段:第一阶段是边建设、边争论、边拆除;第二阶段则是在非正常情况下的拆除。 Beijing City Wall boasts a unique position in the history of the capital of Beijing. However, with the change of the dynasty, the invasion of foreign enemies, and the outbreak of war, it has suffered various degrees of damage. This article presents the transition of Beijing’s cities in the 20th century from 1900 to 1949 and 1949 to 1976. Since 1949, the demolition of the city wall was divided into two stages: the first stage was the construction, the dispute, and the demolition; the second stage was the demolition under abnormal conditions.