Abstract: In this paper, the covective motion of baroclinic fluidis studied experimentally inarotating annulus subject to a negative radialtem perature gradient. General characteristicsof baroclinic wave in this svstem have been obtained.Through measuring temperature fieldof baroclinic waves at many levers and fine grids,we have obtained the three-dimentionaltemperature structures of baroclinic wave and temperature distributions of quasi-surfacewave-state jetstream. The unstability of wave-wave transformation has als...