  We study the localization properties of weakly interacting Bose gas in a
quasiperiodic potential commonly known as Aubry-Andr\'e model. Effect of
interaction on localization is investigated by computing the `superfluid
fraction' and `inverse participation ratio'. For interacting Bosons the inverse
participation ratio increases very slowly after the localization transition due
to `multisite localization' of the wave function. We also study the
localization in Aubry-Andr\'e model using an alternative approach of classical
dynamical map, where the localization is manifested by chaotic classical
dynamics. For weakly interacting Bose gas, Bogoliubov quasiparticle spectrum
and condensate fraction are calculated in order to study the loss of coherence
with increasing disorder strength. Finally we discuss the effect of trapping
potential on localization of matter wave.
