  The T2K experiment is a long-baseline accelerator neutrino experiment using a
near detector complex ND280 and a far detector, Super-Kamiokande. Neutrino
interactions are detected by Cherenkov light in Super-Kamiokande in order to
measure neutrino oscillation parameters. The accuracy of the oscillation
parameter measurements depends on our knowledge of neutrino interactions, the
neutrino flux and the detector response. ND280 is composed of a tracker and
several sub-detectors designed to characterise the neutrino beam before
oscillation, which allow us to constrain the uncertainties on the neutrino
interaction and the accelerator flux models. In this talk we present the result
of a fit on the ND280 data, as well as a study of the robustness of the fit to
the choice of neutrino interaction model. The constraint obtained on the
oscillation parameters is also discussed.
