The latest results on top quark pair cross-section measurement at the LHC-ATLAS experiment

The latest results on top quark pair production cross-section measurement in proton-proton collisions at $\sqrt{s}$ = 7\,TeV and $\sqrt{s}$ = 8\,TeV with the ATLAS detector are reported. The inclusive cross-section was measured with relative uncertainty of 4\% using the final state of the top quark pair including an electron and a muon. The measurement of the differential cross-section as functions of various observables such as the transverse momentum and the rapidity of the top quark and the invariant mass of the top quark pair system are also reported. These results are compared with various generators such as {\sc Powheg}, {\sc Alpgen} and {\sc MC@NLO} and various sets of parton distribution functions.