As the wide application of new Information and Communication Technologies(ICTs) shows, the world is moving fast towards an information age. Since China was first connected to the Internet in 1994, the development of ICTs in China and around the world has been astonishingly fast, and yet there is a clear ′digital divide′ among different regions in China. Although Chinese geographers have paid attention to regional differences in informatization, they usually employ a limited number of indicators, mainly focusing on the Internet. In fact, informatization is a much broader concept, covering not only the Internet, but also mobile phones as well as user ability. In the light of these considerations, this study provides a comprehensive examination of the development of informatization and its spatial differences in China. First, based on a literature review, the paper identifies 29 preliminary indicators for measuring informatization, and employs principal components analysis and the fuzzy analytic hierarchy process to streamline them into 12 indicators to form an ICTs Development Index(IDI). Second, by using the data from provincial statistical yearbooks and the China Internet Network Information Center, the paper calculates the IDI of each mega-region and each province in 2000–2010, and measures the changing spatial differences in the development of informatization in China. Lastly, the paper quantifies the relationship between informatization and economic growth. The empirical results show that the IDI of the western and central China has been increasing faster than that of the coastal region, indicating that the digital divide in China has been narrowing. As the wide application of new Information and Communication Technologies (ICTs) shows, the world is moving fast towards an information age. Since China was first connected to the Internet in 1994, the development of ICTs in China and around the world has been astonishingly fast , and yet there is a clear ’digital divide’ among different regions in China. Although Chinese geographers have paid attention to regional differences in informatization, they usually employ a limited number of indicators, mainly focusing on the Internet. In fact, informatization is a much broader concept, covering not only the Internet, but also mobile phones as well as user ability. In the light of these considerations, this study provides a comprehensive examination of the development of informatization and its spatial differences in China. First, based on a literature review, the paper identifies 29 preliminary indicators for measuring informatization, and employs principal components analysis and the fuz zy analytic hierarchy process to streamline them into 12 indicators to form an ICTs Development Index (IDI). Second, by using the data from provincial statistical yearbooks and the China Internet Network Information Center, the paper calculates the IDI of each mega-region and each province in 2000-2010, and measures the changing spatial differences in the development of informatization in China. Lastly, the paper quantifies the relationship between informatization and economic growth. The empirical results show that the IDI of the western and central China has been faster faster than that of the coastal region, indicating that the digital divide in China has been narrowing.