We study the behavior of the soliton which, while moving in non-dissipative medium encounters a barrier with dis- sipation. The modelling included the case of a nite dissipative layer as well as a wave passing from a dissipative layer into a non- dissipative one and vice versa. New eects are presented in the case of numerically nite barrier on the soliton path: rst, if the form of dissipation distribution has a form of a frozen soliton, the wave that leaves the dissipative barrier becomes a bi-soliton and a re ection wave arises as a comparatively small and quasi-harmonic oscillation. Second, if the dissipation is negative (the wave, instead of loosing energy, is pumped with it) the passed wave is a soliton of a greater amplitude and velocity. Third, when the travelling wave solution of the KdV-Burgers (it is a shock wave in a dissipative region) enters a non-dissipative layer this shock transforms into a quasi-harmonic oscillation known for the KdV.