Performance of the ATLAS Liquid Argon Calorimeter

The Liquid Argon Calorimeter, as a part of ATLAS detector, is to measure energy of particles produced in the p-p collision at CERN Large Hadron Collider. The system consists of Elctromagnetic Calorimeter(EM), Hadronic End-Cap and Forward Calorimeter. Since its installation completing in 2008, variant performance studies are made using cosmic data, single beam data as well as collision data both at 900GeV and 7TeV. After careful studies, we conclude that the Liquid Argon Calorimeter performance matches its design parameters. This paper is showing the robust studies on it performance.