  In this note, we consider the problem on the preservation of stability under
the Fourier-Mukai transforms. We first show that the Fourier-Mukai transform on
an abelian surface or a K3 surface does not always preserve the stability, even
for a $\mu$-stable vector bundle. We next provide some positive results on this
problem. Finally we discuss the birational map of moduli spaces on an abelian
surface.
