In the ten years after the Smart City was put forward, there are still problems like unclear concept, lack of top-down design and information island. With the further development of the Internet, the brain-like architecture of the Internet is becoming clearer and clearer. As a product of combination of city buildings and the Internet, the Smart City will also have a new architecture, and the City Brain thus appears. Based on the Internet Brain, this paper describes how to construct the Smart City in the form of brain-like tissue, and how to evaluate the construction level of the Smart City (City IQ) relying on the Big SNS (city neural networks) and city cloud reflex arcs. Index Terms-Smart City, Brain Science, City Brain, Internet Brain,City IQ,Big SNS, Cloud reflex arcs
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