This research paper aims to find a synergetic communication model in the formulation of the Regent's regulatory policy on the Mount Sinabung eruption contingency plan. This study was conducted with descriptive qualitative methods, the data collection techniques were through interviews, observations, and documentation related to the rule of the Karo Villagers on the Mount Sinabung eruption contingency plan. Research results are in the form of a communication process model in the proposal, decision-making process, and policy on the contingency plan of the eruption of Mount. Sinabung in North Sumatera. The contribution of this research is a new model in the policy formulation of the Mount Sinabung eruption contingency plan.