In this paper, we investigate the topology of complex Finsler manifolds. For a complex Finsler manifold (M, F), we introduce a certain condition on the Finsler metric F on M. This is a generalization of Kahler condition for the Hermitian metric. Under this condition, we can produce a Kahler metric on M. This enables us to use the usual techniques in the Kahler and Riemannian geometry. We show that if the holomorphic sectional curvature of $ M isgeqC^2>0; for; some; c>o,; then; diam(M)leqfrac{pi}{c}$ and hence M is compact. This is a generalization of the Bonnet`s theorem in the Riemannian geometry.