15世纪明成祖在永乐年间修建北京城时,共建了九个城门:正阳、祟文、宣武、安定、德胜、阜成、朝阳、东直、西直。到了16世纪,明嘉靖年间,增建了外城,又建了七个城门:即永定、左安、右安、广安、广渠、东便、西便。20世纪,民国时期,又在正阳门和宣武门之间,拆除了一段城墙,修建了和平门。日本侵华时期,20世纪 In the 15th century, when Ming Chengzu built Beijing City during the Yongle period, nine gates were built: Zhengyang, Chongwen, Xuanwu, Anding, Desheng, Fucheng, Chaoyang, Dongzhi and Xizheng. In the 16th century, during the Ming Jiajing period, an additional outer city was built and seven other gates were built: Yongding, Zuo’an, You’an, Guang’an, Guangqu, east and west. In the 20th century, during the period of the Republic of China, between the Zhengyang Gate and Xuanwumen, a section of the city wall was demolished and the gate of peace was built. Japanese invasion of China, 20th century