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The spreading of Coronavirus has turned a global public health challenge into a series of global economic，social，and political challenges. Involution has become the new policy orient of quite a few countries，which may lead the temporary meltdown of international flow of people and products into a long-term shrinking of exchange in all the aspects of globalization. As the node and hub of the globalization，world cities must re-evaluate their strategic positions internationally，nationally，and regionally. In this sense，Double Circulation，to seek the balance between globalization and embeddedness，shall not only be the strategic choice of Chinese cities but also the option for the whole city world.

Silk City 2.0 Index. This is the 5th round of such analysis carried out by this Blue Book. Noticing the pandemic situation，a new indicator reflecting the city’s public health capabilities is set up during this round of evaluating. Among those 350 sample cities，30 important node cities have been identified comparing with only 23 important node cities in last round. Singapore，Seoul，and Thailand are the top 3 node cities in channeling OBOR with cities from China.

Urban Innovation. Top 100 global innovation clusters and potential growth centers across Great Britain have been analyzed with suggestions for China city to continuously enhance the science and technology intensity of innovation clusters，This section also introduces London’s project as “Europe AI Capital” and Cities inclusive efforts while facing Challenges Arising from Technological Change.

Urban Economy. The section，focusing on post-pandemic recovery，introduce the general strategy for urban economic recovery as well as tactics for investment and employment promotion.

Urban Society. This year’s cases for urban society section focus on health issue. The concept of Medical Center City has been introduced as a new benchmark for world cities. New York’s response to urban population aging has been studied in representing Mega-city’s case. Small and Medium-Size Cities’ efforts in leveraging the built environment for urban health equity provide another mirror for even more world cities.

Urban Culture. Editors review the policy design and infrastructure development in raising cultural charm of 4 best international metropolis，namely London，New York，Paris and Tokyo. Editors also studied Kuala Lumpur’s road map in becoming a City of Culture and Creativity as well as South Perth of Australia its cultural planning. These shall be very enlightening in comparing the cultural development efforts between a developing mega-city and a small community town from developed world.

Urban Ecology. In response to climate change，this section introduces both demand-side solution as consumption intervention promoted by C40 and supply-side solution as building regional Hydrogen Economy in South Yorkshire.

Urban Governance. For the second year，the analysis of the American mayors’speeches during this year of pandemic has been introduced. This section，using 2 case studies，also discuss how to ensure new technologies not only increase efficiency but also promote fairness in the city life.

Urban Space Development. This section collects three cases of large city，median city，and small city separately to showcase the new wisdom of space development. That are UK’s case in awakening large city’s sleepy suburb，Medium Cities’ guide in Promote fair transportation，and US Best Small Cities’ characteristics of winning.

Silk Cities. In global scale，Leading Maritime Capitals of the World have been studied. In regional scale，Arab Cities’ state are reported. In city scale，Davao City of Philippine are studied as a case of emerging Silk City.