Abstarct: Dehmolla region is located in the southern part of Eastern Alborz and in the north of Shahroud-Damghan road. The study area is structurally part of the Alborz Mountains in the Alpine-Himalayan orogenic zone. Different sedimentary rock units with east-west direction have formed specific formations in Dehmolla area, Which includes Paleozoic formations (Soltanieh, Barut, Zagun, Lalon, Mila, Jiroud), Mesozoic (Shemshak, Delichai and Lar formations) and Quaternary sediments. Mila Formation is the main subject of this research. This formation represents the middle-upper Cambrian rocks of Alborz, which consists of 5 members. Member 1 of this formation in Dehmolla region consists of 67 m of gray dolomites of mass to thick laxyer with chert nodules and flat stromatolites. Member 2 of this formation consists of 95 m of thin to medium laxyer limestone, gray coarse limestone and thick yellow dolomites of the stromatolithic laxyer. Member 3 of Mila Formation has 55 m sequence of sandstone, limestone and sometimes between mud laxyers. The thickness of member 4 of Mila Formation is 231 meters, which is a periodic laxyer of green shale and thin limestone in the middle laxyer. This member with a red horizon reaches member 5 of this formation, which consists of 121 meters of sandstone laxyers with inter-shale laxyers. Structurally, the faults of the region include two categories of faults with two different trends. The first category is faults that follow the structural trend of the region and have a northeast-southwest trend. These faults include F1, F3, F4, F5 and F7 faults And transverse faults of the region that were identified by the northwest-southeast trend in the region, The F2 and F6 faults are the right-lateral strike-slip mechanism. F3 and F5 faults are faults with reverse mechanism. According to the Rose diagram of the extended for fractures in the region, 3 series of fractures have been introduced. These fractures include fractures (J1) with an average position of 65/155, fractures (J2) with an average position of 70/175 and fractures (J3) with an average position of 72/075. Fracture categories J1 and J2 have the highest percentage of fractures. These fractures are in the category of synthetic fractures with the fault. J3 fractures with F7 faults form an angle of 75 degrees, which are classified as R 'fractures. These fractures are antithetic fractures with the F7 fault.