  This paper has been withdrawn by the author due to a crucial sign error in
equation 1. An isometry $\rho$ of a connected Finsler space $(M, F)$ is called
bounded if the function $d(x, \rho(x))$ is bounded on $M$. It is called a
Clifford-Wolf translation if the function $d(x, \rho(x))$ is constant on $M$.
In this paper, we prove that on a complete connected simply connected Finsler
space of non-positive flag curvature, an isometry is bounded if and only if it
is a Clifford-Wolf translation. As an application, we prove that a homogeneous
Finsler space of negative flag curvature admits a transitive solvable Lie group
of isometries.
