Measurements of CP violation parameters in the B system with the ATLAS dete
ctor at LHC are reviewed. Measurements of sin 2 beta in the B-d(0) --> J/ps
i K-S(0) channel and of sin 2 alpha in the B-d(0) --> pi(+)pi(-) channel ar
e described in details. Other channels sensitive to the angles gamma and de
lta gamma are also presented.