The Tula A_2-subtype granite pluton is located between the Altun fault and its branching fault. According to the geological,geochemical,REE and trace elements characteristics,it belongs to the A_2 (PA)subtype granite.The SHRIMP U-Pb zircon dating gives a result of 385.2+8.1 Ma,which is located between the Middle and Late Devonian in the international stratigraphic chart,and can be regarded as the crystallization age of the Tula granite.The study indicates that the Tula area was in a local extensional environment in the end of the Middle Devonian,and that environment was probably related to the synchronized strike-slip activity of the Altun fault. The Tula A_2-subtype granite pluton is located between the Altun fault and its branching fault. According to the geological, geochemical, REE and trace elements characteristics, it belongs to the A_2 (PA) subtype granite. The SHRIMP U-Pb zircon dating gives a result of 385.2 + 8.1 Ma, which is located between the Middle and Late Devonian in the international stratigraphic chart, and can be considered as the crystallization age of the Tula granite. The study indicates that the Tula area was in a local extensional environment in the end of the Middle Devonian, and that environment was probably related to the synchronized strike-slip activity of the Altun fault.