A primary and integrated part of the EMS, the law of environmental impact assessment（EIA） is one of the basic environmental protection laws in China. Improving the public participation（PP） in EIA can help address the issue of the role of public participation in EIA. Preliminary studies were conducted regarding how to complete public participation programs, on basis of reviewing the history of development of public participation at home and abroad. The connotation of public participationology and key points were outlined to make PP system perfect and reasonable through relevant research.