Today, protected areas are known as one of the most beneficial forms of sustainable and multilateral productivity and protecting the land. Maintaining basic ecological processes and vital systems, preserving the diversity of aquatic and terrestrial environments, and providing sustainable living conditions are among the most common benefits that protected areas would provide to the community if they are well-managed. The importance of coastal-marine protected areas is clear that today, about 6.5 percent of the surface water of the earth, with an area of about 23 million square kilometers, are called coastal-marine protected areas, but the conservation of the marine environment is still far from terrestrial protected. In Iran, the only national marine park that is protected by the environmental organization is the Nayband park in Bushehr, which creates the necessity that due to the potential of the Makran region in the north of the Oman Sea because of the presence of important species, Key habitats as well as conservation of fishery resources, so using scientific methods for making a network in this 7000 square kilometers area. The purpose of this research is to prioritize suitable conservation areas in the coastal waters of Makran in the southern province of Sistan and Baluchestan and to select the most suitable patch to be added to the network of protected marine areas in Iran. For this purpose, protective criteria including 5 types of bedding (Mangrove cover, coral reefs, sponges, seaweeds and marine grasses), green turtle nest site, important distribution areas of birds and suitable dolphin habitat is used. The modeling of the potential habitat of dolphins was done using the Maximum Entropy software. The results of this model with the AUC of 0.8 showed that parameters such as distance from the coast and surface water temperature play an important role in determining the distribution of dolphins. To select and prioritize the appropriate protected areas, a simulated annealing and iterative improvement algorithm are used under the Marxan software. The protective purpose for each of the criteria was specifically and individually determined in terms of their degree of importance and with the goal of minimum protection, 20-30% and 50% of each criterion. The model with 100 replications and three different scenarios were used to determine the appropriate value of the boundary length modifier factor. The results of BLMs 1, 0 and 10 showed that BLM = 1 is the most appropriate BLM in determining coastal-marine important areas. Since, in order to protect the diversity of habitats and species, it is necessary to select the representative regions and sample of the total nature of the land or sea so we have to prioritize the selected areas. In this study, areas such as Govatwr bay, Kachoo, Chabahar coral reefs, Pozm gulf and also Tang as high protected areas for Conservation. Various parameters, including conservation targets, different algorithms and the amount of compression of selected protective patch, are involved in the prioritization and selection process of coastal-marine protected areas, thus determining the appropriate values for these parameters, except the most basic stages in Protective plans are for marine areas. Keyword : Conservation Planning, Marxan, Makran Region, MaxEnt,Praioritizati