  Ground state of the bond-random antiferromagnetic S=1 Heisenberg chain with
the biquadratic interaction -\beta\sum_i(S_i S_i+1)^2 is investigated by means
of the exact-diagonalization method and the finite-size-scaling analysis. It is
shown that the Haldane phase \beta\sim0 persists against the randomness;
namely, no randomness-driven phase transition is observed until at a point of
extremely-broad-bond distribution. We found that in the Haldane phase, the
magnetic correlation length is kept hardly changed. These results are
contrastive to those of an analytic theory which predicts a second-order phase
transition between the Haldane and the random-singlet phases at a certain
critical randomness.
