Abstarct: Chah musa igneous dome is part of the Turoud – chahshirin magmati belt and located in the northern part of Central Iranian structural zone. Volcanic-pyroclastic sequences of Eocene including of volcanic breccia,,agglomerate and red tuff are the oldest rocks within the studied area. Elliptical - shaped and subvolcanic dome of Chah musa which is porphyritic andesitic in composition, is the host of copper deposit and cut volcanic-pyroclastic sequences. Plagioclase is the main constituent mineral, hornblende and small amount of biotite, magnetite, apatite and quartz are the most important accessory minerals at andesitic dome. Dacite lava located on the top of red Tuff contains coarse plagioclase, biotite, quartz and amphibole needles in a relatively glass and fine grained crystals. These rocks cover the northern margins and extended to the eastern borders of andesitic dome. In order to investigation of the emplacement mechanism of this subvolcanic pluton, anisotropy of magnetic susceptibility (AMS) is used. Accordingly, the average of the bulk magnetic susceptibility (Km) in andesitic dome is 4500 μSI. This value is 8500 μSI for dacitic lava. The high magnetic susceptibility (Km>400μSI) is due to the presence of magnetite as a magnetic carrier. Consequently, subvolcanic dome of Chah musa belonges to ferromagnetic and magnetite series granites. The nature of magnetic minerals has been identified using by magnetic susceptibility changes with temperature data (thermomagnetic curves). These results show that how the magnitude of magnetic susceptibility decreases along with the progress of the various stages of hydrothermal alteration due to the elimination or reduction in size of magnetic minerals magnetite or convert it to another (such as hematite and pyrite). The highest degree of anisotropy (P%) observes along the small diameter of Chah musa elliptical dome. The lowest anisotropy occurs along the large diameter i.e., the northern east to west - southwest of the pluton. Despite the relatively high strain, no microstructure is recorded due to porphyry nature and high proportion of liquid/crystal at the time of emplacement. Highest areas and around the main summit dome Chah musa that can be considered as the roof of the dome, shaped parameter (T) is oblate and positive. The central part of andesitic dome also has a high-plunge magnetic lineation. Lineation is low to medium plunges at margins. Strike of foliation at the sampling stations display concentric pattern and the slopes are above 30 degrees. The absence of petrographic zonation, concentric pattern through the subvolcanic pluton from core to contact with country rocks, oblate fabric at the floor of dome, intense crushing and deformation at the country rocks especially at western margins, inclined red tuff and dacitic lava are the main evidences that the pluton emplaced as a balloon. According to the left-slip faults of Anjilo and Toroud and govern tectonics of the region during the emplacement of the Chah musi dome, it can be concluded that a dextral shear zone providing tensional spaces required for magma ascend and emplacement at Torud-chahshirin magmatic belt.