The objective of this study were to study the expanding network for environmental protection in Amphoe Klang, Nan Province. The researcher studied documents made conversations and interviews to collect data. It took from each person there. It was a participation research. We also participated in number of activities in Chum Chon Ban Chedi Amphoe Chiang Klang, Nan Province. The role of community enterprises affects the strength of community forestry management. The result of the study were as follow : The important factor that helped strengthen the community forestry management was the environment. When many problems about environment occur such as floodwater ( following heavily rain ) serious drought, wild fires and sanitary wastes at the landfill they lead to public complaints. The people in the community organized themselves as a saving environmental protection group to solve the problems. However, this situation will has an emphasis on unity and self – sacrifice for the benefit of the community. There are many activities for environmental protection which a community can do, such as plant trees on holidays, enhance the King ‘ s projects, fire belt, shelter belt, water retention basin and the community constitution, where they realize their problem can not be solved without environmental protection. So they try to find the guidelines for environmental protection to expand the network forever.