中文摘要：

公众对环境保护的参与热情日益升温,特别是对于新建PX项目等可能造成重大环境事件的关注程度非常高,对这一问题的研究具有重大的现实意义。本文以PX项目选址所引起的公众网络参与为案例,从网络舆论中的公共意识和意见领袖两个方面分析了网络舆论在互联网中的形成和演化,提炼出以PX事件为典型代表的环境网络事件的发展过程。本文的研究价值在于：第一,总结出环境保护类网络舆论事件的演化过程,对政府在该类舆论形成过程中的干预选择给出建议;第二,对网络舆论事件中政府行为的研究,有助于提升政府与普通公众的沟通与融合,增加公众参与环境政策制定的机会。

英文摘要：

With the change of the traditional media to cyber network, public opinion dissemination has changed a lot. The citizens gradually keen to express their views on the Internet, which has a profound impact on public dissemination process and become a reality for more public participation. Not only that, the Internet space has gradually formed on the public issues in public awareness and public opinion leaders, also the subject of public opinion has been shown high-speed, globalization. Cyber Network Participation in environmental protection has greatly improved the public communication, fusion, the dissemination of opinions and made public opinion tend to expose and criticism of the reality. One of hottest flashpoints of internet are environmental problems, especially the PX problem has become the focus of public opinion in the network of hot debate. The research not only helps to understand the process of public consciousness in network environment, and also reflects the government at this stage does face a lack of credibility of the big problem, but the public or express the adjustment to the government policy and the policy response to the hope.