A layer index	B layer index	C layer index	System
A1 Compactness of urban form	B1 compactness of population	The density of resident population	Butterfly catastrophe
		The proportion of non agricultural population to the total population
		The net population migration within province
		The interprovincial net population migration
	B2 compactness of land use	The proportion of built-up area in the municipal district	Cusp catastrophe
		The green coverage rate of built up area
A2 Compactness of urban function	B3 function of dwelling	The residential investment	Swallowtail catastrophe
		The faculty-to-student ratios of primary schools in municipal districts
		The number of beds in hospitals and health centers per 10000 people
	B4 function of transportation	The number of bus and trolleybus per 10,000 people	Butterfly catastrophe
		The pavement area per capita
		The number of public operating vehicles at the end of the year
	B5 function of work	The average number of employees on duty per square kilometer	Butterfly catastrophe
		The average wage of workers
		The GDP per square kilometre in municipal district
		The GDP of the third industry/the GDP of the second industry
	B6 function of recreation	The park green area	Butterfly catastrophe
		The number of books per hundred people in Public Libraries
		The domestic tourism income
		The retail sales of social consumer goods