  We show that the hypothesis of abelian dominance allows QCD-monopoles to
preserve the topological feature of the QCD vacuum within SU(2) lattice gauge
theory. An analytical study is made to find the relationship between the
topological charge and QCD-monopoles in the lattice formulation. The
topological charge is explicitly represented in terms of the monopole current
and the abelian component of gauge fields in the abelian dominated system. We
numerically examine the relation and demonstrate the abelian dominance in the
topological structure by using Monte Carlo simulation.
