Urban System is composed of all kinds of cities which not only are depended on and confined each other but also have different size and functions in a country or a region.

• 城市体系是指一个国家或一个地区的地域范围内,由相互联系、相互制约的具有不同规模和不同职能的各种城市和城镇所构成的有机整体。