Abstarct: The studied area is located in south of Bahabad (northeast Bafq(Yazd)) and include an area with 160 Km2 by following geographical coordinate 55º 52´ 30" to 56º eastern longitude and 31º 45´ to 31º 52´ northern latitude. This area belongs to central Iran structural zone and is a part of Poshte-Badam block. The rock unites of Cambrian, Ordovician, Silurian, Triassic, Jurassic, Paleocene, Pliocene and Quaternary have been exposed in this area. The studied plutons intruded in Cambrian rock complex but these intrusions have not been intruded in the Silurian or younger unites, furthermore with respect to all of the geological evidence, it's appears that the mentioned plutons have late Ordovician to early Silurian age. Host rocks include acid to intermediate volcano sedimentary rocks of early Cambrian which known Narigan series, Lalun sandstone and Khuhbanan limestone, the latest manifestions of the studied magmatism have been outcropped such as early Silurian basalt. The studied intrusive rocks have a lithilogical range include gabbro, diorite, syenite and granite. This rocks show granular, ophitic, sub ophitic, mirmekite, graphic and porphyroid textures. Gabbros have been supposed a potassic mextasomatism prosses. New mextasomatic biotite, absorption and crosshatch texture in plagioclase and producing a rim or a mantle of orthoclase around the plagioclase are some of evidence of this prosses. Fractional crystallization of gabbro/ diorites results to increasing of K2O and evoluted them to syenite. The evidence of this subject has been clearly observed in field. Mineralization of magnetite, magnetite- apatite, pyrolosite, barite, chalcopyrite and malachite, which observed in the south of Bahabad (studied area) have been very closed genetically relation to the studied igneous rocks. There is a compositional gap between mafic and felsic rock compositions on the geochemical diagrams, but field evidence (field observation) don't emphasize this subject. However detailed investigations indicate it. In addition to common fractional crystallization, crustal anatexi and magma mixing have been rolled in magmatic evolutions. The studied rocks have alkaline, sub alkaline, mextaluminous to peraluminous nature. Granites are I and A type and belong to RRG (rift related granitoieds) and WPG (within plate granitoieds), also granites have magma mixing origin and they classified in Hss type of Castro et al (1990) classification. They were generating by mixing of fractional parts of mantel's magma and magma which resulted of crustal anatexi. Gabbro/Diorites are originated from crystallization and evolution of mantle alkaline magma which located under continental lithosphere. Magma forming of these rocks probably generated from low partial melting of a garnet peridotitic source rock in 80 to 100 Km below the surface of the earth. In summary the studied rocks have been formed in final activities of Cambrian rifting events which manifested as intrusion with Gabbro to Granite composition and or sub volcanic and volcanic equivalent late Ordovician –early Silurian age.