  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.
