  The gravitational microlensing experiments in the direction of Large
Magellanic Cloud (LMC) predict a large amount of white dwarfs ($\sim 20%$)
filling the galactic halo. However, the predicted white dwarfs have not been
observed at the galactic halo. To interpret the microlensing results and
resolving the mentioned problems, we use the hypothesis of spatially varying
mass function of MACHOs, proposed by \cite{ker98} (hereafter KE). However the
KE model is not compatible with the duration distribution of events
\cite{rah04a}. Here we use more realistic power-law model of MF, $dn/dm\propto
m^{\alpha}$ for the MACHOs of halo. The index of MF in this model changes from
-2.7 for stars with $m>1 M_{\bigodot}$ at the central part of galactic halo to
the substellar regime with an upper limit of -1 at the edge of halo. We show
that in contrast to the abundant brown dwarfs of galactic halo, heavy MACHOs
can be responsible for the microlensing events in the direction of LMC.
