Today, the choice of decision-making style directly affects the effectiveness of rural development plans. By knowing the characteristics of each of these styles, management institutions can choose the most efficient style according to their local needs and challenges. While the studies show that the decision-making style used in the preparation and implementation of Iran's rural development plans is of low effectiveness, this research was compiled in 1402 to rank decision-making styles based on effectiveness in the preparation and implementation of rural Development plans in Iran. The present research methodology is designed from the philosophy of positivism based on quantitative mode, which is placed in a practical framework with descriptive-explanatory purposes. The data collection method was carried out using the framework of library study and field survey, and the evaluation ranking method based on the distance from the average solution (EDAS) was used to analyze the data. The results obtained from the model show that the participatory decision-making style, with a score of 1, has the highest level of effectiveness in the preparation and implementation of Iran's rural Development plans; the Social decision-making style, with 0857 points, the technical decision-making style with 0.153 points, and authoritarian decision-making style with a minimum score of 0 are ranked next. It is inferred that the participatory decision-making style is more effective than other styles due to having two key features, namely "social outlook" and "accepting a high level of ambiguity" in the decision-making process within rural projects. The participatory decision-making style is more effective than other styles for preparing and implementing Iran's rural Development plans due to the analysis of social contexts, the creation of participation capacity for all stakeholders, and the efficient implementation of rural development programs. Therefore, it is suggested that the planners take advantage of the active participation of all actors, including the villagers, in preparing master plans from preparation to implementation.