  We study, in the path realization, crystals for Demazure modules of affine
Lie algebras of types $A^{(1)}_n,B^{(1)}_n,C^{(1)}_n,D^{(1)}_n,
A^{(2)}_{2n-1},A^{(2)}_{2n}, and D^{(2)}_{n+1}$. We find a special sequence of
affine Weyl group elements for the selected perfect crystal, and show if the
highest weight is $l\La_0$, the Demazure crystal has a remarkably simple
structure.
