  We are concerned about the barotropic compressible Navier-Stokes equations
with density-dependent viscosities which may degenerate in vacuum. We show that
any classical solution to barotropic compressible Navier-Stokes equations in
bounded domains will blow up, when the initial density admits an isolated mass
group and the viscousity coefficients satisfy some conditions. A new condition
on viscosities is first put forward in this paper.
