Three-dimensional flows of nonequilibrium plasma in a disk MHDgenerator are examined numerically by taking into account the change of gasproperties. The nonuniform plasma of "streamer" owing to weak ionization ofseed material has a spiral structure in r-Bplane， and the plasma becomes almostuniform between the walls in r-z plane. In addition to the streamer， the nonunifor-mplasma of "domain" owing to weak ionization of noble gas is revealed. Thedomain has the structure perpendicular to the streamer. In a strong MHD interac-tion case， the static pressure considerably increases in the upstream region of ageneration channel， and the pseudo-shock waves appear in the generator， but theplasma is almost uniform along e-direction. The boundary layer in the strongMHD interaction is considerably thick， and in the broad region near the wall theHall current flows reversely. In the weak MHD interaction case， the current flowstoward downstream even near walls. In the strong interaction case， however， thecurrent near walls flows mainly e-direction， and exists like leak current.