This paper suggests that the city brain is the product of the evolution of the Internet from a mesh to a brain-like architecture since the 21st century and it is combined with the construction of smart cities. Through a comparison with the developmental process of the biological brains, an age assessment model of the maturity of the city brain development is established。 With the evaluation model, the various age groups are first identified through the unified planning scope of the urban brain. The District and the County correspond to 0-5 years old (children level), the City corresponds to 6-11 years old (children level), and the Province corresponds to 12-17 years old (juvenile level） , the Country corresponds to 18-23 year old (youth level), and the world corresponds to 24-29 years old (adult level).Then with the evaluation model, the construction quality is evaluated from six aspects: the problem solving, the digital neuron, the cloud reflex arc, the cost performance, the safety, and the integrity. After the evaluation value is converted into an age increment, it is added to the minimum value of the age group to form the developmental age of the city brain.

city brain  /  smart city  /  development maturity