Based on the theory of protection motivation,environmental risk perception is divided into four dimensions:fact perception,cause perception,loss perception and reaction behavior perception.Using 839 field survey data from Jiangsu and Anhui provinces,structural equation model is used to explore the impact mechanism of multi-dimensional environmental risk perception on people’s pro-environmental behavior in the public sphere.The results show that different dimensions of environmental risk perception have different impacts on people’s pro-environmental behavior in the public sphere,with reaction behavior perception having a significant positive impact on people’s pro-environmental behavior in the public sphere,and responsibility consciousness playing an intermediary role in the impact of environmental risk perception on people’s pro-environmental behavior in the public sphere.Specifically,fact perception and cause perception have no direct or indirect impact on people’s pro-environmental behavior in the public sphere.What’s more,loss perception has no direct impact on pro-environmental behavior in the public sphere,but it can have an indirect impact through the sense of responsibility and reaction behavior perception can also have an indirect impact on pro-environmental behavior in the public sphere through responsibility consciousness.Therefore,it is feasible to guide people to practice pro-environmental behavior in the public sphere through strengthening environmental cognitive education,stimulating environmental emotion and cultivating sense of responsibility so as to build a modern environmental governance system with the participation of all the people.