## 4 The Development Prospect and Technological Breakthrough of DC
### Prospect of Digital SC Construction  
The internet going digital is only the first step in building a city. The second step is connecting the parts of the city through the DCs of the internet, so that they can be networked. Electronic commerce and electronic government affairs are the network. The third is network communication, and the most basic is the local intelligent response, that is, smart planning stages, smart tolls, smart transportation, etc. The fourth part is the part of the city in the interconnectivity stage. Under the evolution trend of human beings, the optimization movement aims to realize the SC and basically build an SC. It is an imperative trend to develop from the digitalization of a single system to the deep integration of the whole city system, from system construction to sustainable operation, and from government leading to market-oriented multi-subject participation. In the future, SC will develop from urban digitization to DC, and the whole city will form a \"digital giant system\" in the digital field. The main vein of urban economic development is from industrial economy and digital economy to intelligent economy. Among them, the digital economy can play a driving role in an industrial economy, thus giving birth to industrial digitization, industrial internet, DTs factories, etc. First principles thought was first put forward by the Ancient Greek philosopher [PERSON]: \"In every systematic exploration there are first principles.\" First principles are fundamental propositions and assumptions that can't be omitted, deleted, or violated. Informationization aims to reduce the trust cost and internal friction in the organization through the efficient circulation of information, thereby achieving diminishing marginal cost. The reduction of the marginal cost of infrastructure and public service is the fundamental driving force of urban agglomeration, which inevitably has internal demand for informational. With the comprehensive digital transformation of urban planning, construction, operation, and management, cities can adjust their running state at an increasingly high frequency and even in real-time. Urban planning and operation and service links are increasingly inseparable and gradually integrated. The city's perception system is taken as an example. In the previous SC construction dominated by vertical departments, each department constructed the IoT perception system, such as cameras and sensors. Repeated investments are required from the end equipment to the installation vehicle, and then to the power and network access. In the system construction requirements proposed by each department, they will only consider their own department's business, which will inevitably lead to massive repeated construction, and it also needs to re-gather and integrate various data after decentralized construction. In recent years, the wide application of smart light poles has, to a certain extent, solved the sharing of various roadside terminal installation carriers and power and network access capabilities. Street lamps, signs, 5G base stations, cameras, radars, edge computing nodes, and various roadside sensors can be installed in the same rod. However, further integration of the various cameras installed by multiple departments centralizes the design and overall installation of various sensors. The establishment of an integrated city perception network, as the common foundation of all SC systems, requires a deeper level of top-level design thinking and political wisdom. SC is a process of long-term operation. More traditional project-based construction is completed without regard to the construction effect, so the development of supply chains is not necessarily superior to the development of long-term operating mechanisms. The new wave ushered in a new phase, and the new phase required a new path. After a systematic analysis of the current social development and technology situation, it is proposed to adopt cloud technology to integrate the letter and create the brain and the overall DC.