唐京师长安,有城三重:外一重京城,内一重皇城,又内一重宫城。宫城是皇帝居住和处理朝政的地方,皇城为中央政府机关所在地,居民区与固定贸易区则在京城。宫城与皇城的治安管理,由南北禁军负责。南,为南衙十六卫,北,即北衙禁兵。这种管理体制,唐初就形成了。十六卫,唐初李渊时就有,但名称经常变动,说 Tang Jing Chang’an, a city of triple: a heavy capital, within a heavy imperial city, but also a heavy Miyagi. Miyagi is the place where the emperor resides and handles the affairs of government. The imperial city is the seat of the central government authority, and the residential area and fixed trade area are in the capital. Miyagi and the imperial city of security management, by the North and South Ban Jun is responsible. South, 16 Wei Nan Ya, North, that is, the North Yanen armed. This management system was formed in the early Tang Dynasty. Sixteen Wei, Li Yuan Tang early there, but the name changes frequently, said