With the increasing environmental and ecological problems in China，public participation has been recognized as a way to improve the performance of environmental governance. But，the real effect is often questionable. Effective public participation means good cooperation among the subjects，so the performance of cooperation can reflect the effectiveness of public participation to some extent of disfunction. Therefore the “Jiaxing model” becomes an example which the paper investigates the process of its cooperation under the framework of the cooperative governance，evaluates the process and results performance of environmental public participation from the institutional context，the subjects structure and network，cooperation mechanism，consensus building and so on. At the end of the paper，we have proposed a measurment including authorization，enhancing social subject self-organizing ability，and institutional guarantee.