  Ground-state of the S=1 XXZ spin chain under the influence of the random
magnetic field is studied by means of the exact-diagonalization method. The
S=1/2 counterpart has been investigated extensively so far. The easy-plane
area, including the Haldane and the XY phases, is considered. The area suffers
significantly from the magnitude of the constituent spin. Destruction of the
Haldane state is observed at a critical strength of the random field, which is
comparable to the magnitude of the Haldane gap. This transition is
characterized by the disappearance of the string order. The XY region continues
until at a critical randomness, at which a transition of the KT-universality
class occurs. These features are contrasted with those of the S=1/2
counterpart.
