System dynamic is an effort to understand complexity of social and eco-systems of forest. Through this system, a conscious learning on interaction between people and forest will take place in order to manage forest in more sustainable and equitable manners. A system dynamic modeling was carried out in area surrounding Lumut Mountain Forest, District of Pasir, and East Kalimantan. In the area, where legally was allocated to a logging company, live local people who depend on forest and rattan. The