This article explains the cultural commonalities in the Middle Zagros with an emphasis on the three provinces of Lorestan, Kermanshah, and Ilam. The qualitative research method and data collection techniques are document review and observation. The findings show that in the current situation, three factors are responsible for the decline in social relations in the three provinces. First, the three settlement networks of Pishkooh, Poshtkooh, and Kermanshahan, which have many intra-network relations and few extra-network relations. Second, distinctive ruggedness, and third, abundant communication infrastructure in neighboring areas. Despite the few connections between these three networks, there are many cultural commonalities among them, the most obvious of which are the expansion of the family and kinship system, tribal politics, mourning and mourning rituals, dance, and food. The main reasons for these commonalities lie in the nomadic production method that spread through the tribal communication network in the Middle Zagros. Nomadism led to the formation of a character of generosity, chivalry, the expansion of the family and kinship system, groupism, cooperation and collaboration, and political dominance. These characteristics spread through the north-south and east-west tribal routes that spread from the highlands of Alvand, Green, Sefidkooh, Kabirkooh to the plains of northern Khuzestan, Ilam, and western Kermanshah, which, as a capillary network, made social communication possible in all parts of this land.