一、认识更新众所周知，市场经济条件下，城市中心大多用以安置商业、服务、金融等第三产业，以及必要的交通和市政设施。而一般工厂与居民住宅不宜在中心区多占地。从土地级差地租理论中可知，中心区较非中心区或郊区土地使用的地租费用高，而商业服务设施集中在城市旧区中心 I. Understanding Updates As we all know, under the market economy conditions, urban centers are mostly used to locate tertiary industries such as commerce, services, and finance, as well as necessary transportation and municipal facilities. In general, factories and residential buildings should not occupy more land in the central area. From the theory of differential land rent, it can be known that the central area is more expensive than the non-central area or suburban land use, while commercial service facilities are concentrated in the center of the old urban area.