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An impurity bond $J{'}$ in a periodic 1D antiferromagnetic, spin 1 chain withexchange $J$ is considered. Using the numerical density matrix renormalizationgroup method, we find an impurity energy level in the Haldane gap,corresponding to a bound state near the impurity bond. When $J{'}<J$ the levelchanges gradually from the edge of the Haldane gap to the ground state energyas the deviation $dev=(J-J{'})/J$ changes from 0 to 1. It seems that there isno threshold. Yet, there is a threshold when $J{'}>J$. The impurity levelappears only when the deviation $dev=(J{'}-J)/J{'}$ is greater than $B_{c}$,which is near 0.3 in our calculation.Comment: Latex file,9 pages uuencoded compressed postscript including 4  figure

Impurity energy level in the Haldane gap