Recently neighborhood associations for community-based disaster prevention activity are expected to drive risk communication among community members,aiming at eliminating risk-perception gap.This study formulates a game theoretical model to investigate a communication process in a neighborhood association for community-based disaster prevention activity,and illustrates that the activity guided with manuals is not accompanied by animated risk communication,that is followed by implication that risk communication should be implemented independently of the activity.Moreover the study exhibits larger implementability of risk communication in the case that the activity level is determined by the members in the association.