Due to the presence market failure and government failure，market or government cannot solely take care environmental issues. Therefore the involvement of society plays a significant role in promoting and implementing environmental governance. This paper explains a case study to illuminate the role of the ENGO in dealing with mass incidents and introducing it into the path of collaborative governance. The study concludes that ENGO can construct the mutual trust，common goal，and balance the power pattern. Through these functions，the ENGO helps people to meet the prerequisites for collaborative governance，which is beneficial to mediate intensive environmental conflicts as well as makes a disordering，emotional，and violent scenario become an ordering，rational，and win-win situation by reaching collaborative governance. This study provides a solution for resolving environmental social conflicts and has a certain reference value for deepening the sonceptualize understanding of the participation of ENGO in social governance，as well as provides an empirical evidence for relevant departments to formulate management policies.