A system dynamic approach is applied to explore sociological dynamics on rural community development of a traditional rural in Indonesia namely Wamena. The model is used to explain the causalities relationship of the decision making process of rural communities in responding to the development implemented by the government. The model consists of five main sectors: native population, migrant population, land, food, and agricultural technology. The simulation shows that the dynamics of development pattern is greatly influenced by the interactions of natives and migrants in market activities.