  A widely adopted theoretical scheme to account for the neutrino oscillation
phenomena is the see-saw mechanism together with the ``lopsided'' mass
matrices, which is generally realized in the framework of supersymmetric grand
unification. We will show that this scheme leads to large lepton flavor
violation at low energy if supersymmetry is broken at the GUT or Plank scale.
Especially, the branching ratio of $\mu\to e\gamma$ already exceeds the present
experimental limit. We then propose a phenomenological model, which can account
for the LMA solution to the solar neutrino problem and at the same time predict
branching ratio of $\mu\to e\gamma$ below the present limit.
