This talk presents the latest analysis of Bs->J/psiPhi decay at the ATLAS experiment, measuring the CP-violating phase phi_s, the decay width Gamma_s and the difference of widths between the mass eigenstates Delta-Gamma_s, as well as the transversity amplitudes and corresponding strong phases. The latest results (from 2016) are using integrated luminosity of 21.3 fb^{-1} collected by the ATLAS detector from 8 TeV pp collisions at the Large Hadron Collider, and are statistically combined with the results from 5.08 fb^{-1} of 7 TeV data. All the results are compatible with the Standard Model predictions. In addition an overview of the detector performance relevant for this particular analysis in current and future phases of the ATLAS experiment and the Large Hadron Collider are shown.