In the economic transition period of China，citizens’awareness of environment，supervision and rights is strengthening. With the rapid development of internet technology，our public opinion in public affairs became rather complex. This paper takes Guangxi Longjiang river cadmium pollution in 2012 for example，analyzing media attention and government response at different stages. The results show that government can control public opinion by releasing authoritative information and using new media，on this basis，we make recommendations on government environmental crisis management.