  Viscous GCG(generalized Chaplygin gas) cosmology is discussed, assuming that
there is bulk viscosity in the barotropic fluid and GCG. The dynamical analysis
indicates that the phase
$w_g=-1+\sqrt{3}\gamma\kappa\tau_{g}/(\gamma-\sqrt{3}\kappa\tau_{\gamma})$ is a
dynamical attractor and the equation of state of GCG approaches it from either
$w_g>-1$ or $w_g<-1$ depending on the choice of its initial cosmic density
parameter and the ratio of pressure to critical energy density. Obviously, the
equation of state $w_g$ can cross the boundary $w_g=-1$. Also, from the point
of view of dynamics, the parameters of viscous GCG should be in the range of
$\gamma>\sqrt{3}\kappa\tau_{\gamma}/(1-\sqrt{3}\kappa\tau_{g})$ and
$0<\alpha<1+\sqrt{3}
\kappa\gamma\tau_{g}/(\gamma-\sqrt{3}\kappa\tau_{\gamma}-\sqrt{3}\kappa\gamma\t
au_{g})$.
