Abstarct: Kuh- Zar granitoid pluton cropped out in the south east of Damghan city and located in the northern part of Central Iran structural zone. From geochemical point of view, this pluton has calc-alkaline and mextaluminous nature and belongs to volcanic arc type I granitoid (VAG). Intrusion of this mass into Eocene volcanic and volcanosedimentary rocks and their hydrothermal fluids caused to alteration and mineralization processes. Kuh- Zar granitoid is separable from the point of view of the lithological composition into two microdiotric units in the northwest and southwest and granodiorite at the center. In total, several alteration phases, including the types of phyllic, argillic, and advanced argillic suffered on this intrusive body. In this research, the emplacement mechanism of the Kuh Zar intrusive investigated by using the magnetic susceptibility anisotropy (AMS) method. The mean magnetic acceptability (Km) measured in μSi for microdiorite and granodiorites are as follows respectively: 12397 and 9616. This mass belonged to ferromagnetic granites due to having (Km) more than 500 μSi. The magnetic susceptibility (Km) measured in fresh specimens and altered species of granitoid masses of Kuh- Zar indicate that magnetic susceptibility (Km) is strongly decreased from fresh samples towards alterated rocks. Therefore, there is a direct relationship between magnetic susceptibility, alteration intensity and grain size. Most of the samples in the mountain range have a low anisotropy percentage (average of 5.8%). Investigating the values of the parameter (T) shows that most samples have positive values, and their magnetic ellipsoid is prolate. Magnetic folding in this mass is roughly in different directions, but their general trend is from the northeast to the southwest along with the mass elongation. Most magnetic lineations are parallel to the margins and its elongations, while the stations that extend along the edges cut off the margin. The trend shows that the magma flow has ascend along the northern margin and has expanded to the south with a moderate dip. Regarding the operation of the left-slip faults of Baqhu and Torud and the tectonic governing the region at the time of the establishment of this igneous mass, this hypabyssal dome can be attributed to one of the tensile openings in the shear-transversal shear zone of the Torud– chuh shirin magmatic belt.