Table 2.

Evaluation index system for digitalization

Target	Subsystem	Indicator measurement method
Digitalization	Digital infrastructure	Internet broadband access port (+)
		Office switch capacity (+)
		Mobile telephone exchange capacity (+)
		Mobile phone base station (+)
		Optical cable line length (+)
		Number of sites (+)
	Digital application	Mobile SMS traffic (+)
		Total postal service (+)
		Total telecom business (+)
		Courier business income (+)
		E-commerce sales (+)
		Mobile phone penetration (+)
	Digital industry development	Fixed investment in information transmission, software, and information technology services/total investment in the whole society (+)
		Employment of information transmission, software, and information technology services/urban employment (+)

“+” indicates the attributes of the indicator. “+” means indicator is positive. “/” means division symbol