This report builds a “5+1” evaluation model for global smart cities, and provides five quantitative indicators, namely smart infrastructure, smart economy, smart services, smart governance, and smart innovation, plus one qualitative indicator "smart reputation", a total of six dimensions of comparison, attempts to set a benchmark for global smart cities, and provides diversified solutions for the realization of the Sustainable Development Goals 2030 (SDG 2030) proposed by the United Nations in 2015 as well. The results show that global smart cities can be divided into three levels: "leading", "advanced" and "following". London, New York and Singapore are in the leading position and the star cities in this ranking. They have maintained a leading position in almost every aspect of smart cities and have become role models for other cities around the world.