We believe that the agglomeration effect of the future cities in population, transportation, data, resources, technology, capital, culture, etc., we will call them all kinds of “flows.” The city will be a platform for accommodating, promoting and incubating these “flows”, so that all kinds of “flows” carry their own energy to flow in the city without obstacles. As a platform for various “flows”, the most ideal state of the city is of course the “perpetual motion machine” model, which means zero energy loss, but it can only be a good wish. Therefore, our strategy is to take the energy center of gravity and the city center of gravity to overlap as much as possible, in order to reduce the energy loss of various “flows” in the flow, in order to maintain the sustainable development of the city.