Emergence refers to individuals units through a certain organization, and finally generate a complex whole, showing brand-new characteristics-sas Aristotle said, “the whole is greater than the sum of its parts”. Since the day of its birth, cities have had complex system characteristics such as diversity, relevance, integrity, order, purpose and evolution. Spatial models such as transportation, residence, and commerce continue to collide and overlap, and at the same time continue to integrate with the geographical and social environment, and finally form a rail transit complex project that coexists with vagueness and order, as well as energy and quality. The concept of the supremacy of efficiency, density and sustainable development demonstrated in the TOD-oriented urban practice is leading the future city to qualitative change and leapfrog growth.