In order to analyze the environmental competitiveness of cities in the world’s bay areas，this paper studies and forms the an evaluation mode to evaluate overall characteristics of the environmental competitiveness of 4 cities among the world’s top four bay areas，including Guangzhou，Tokyo，San Francisco and New York City，so as to find out the position of Guangzhou and its advantages and disadvantages and put forward countermeasures for improvement. The evaluation result shows that：Guangzhou’s sub-items of environmental competitiveness are less balanced and have obvious advantages and disadvantages；compared with leading cities，Guangzhou is relatively backward in environmental quality，innovation and development，management and image；Guangzhou should catch up with the leading cities by improving environmental quality，facilities and services，and focus on promoting environmental innovation and development，environmental management and image.