A numerical experiment of the Martian atmospheric general circulation was performed by using a spectral three-level linear-balance model. We examined effects of topography and of radiative scattering of dust suspended in the Martian atmosphere upon the general circulation. Computations were made for a period corresponding to the equinoctial season for the southern hemisphere. Our results indicate that in the stage of development of a dust storm, topography, when it exists in the dusty field, would have a very important role for intensifying winds and suspending dust particles blown up from the surfaces in such a specified region as the Hellas region and that thermally forced transient waves produced by radiative effect of dust are superposed on the quasistationary disturbances induced by the topography. As a result, large coupled oscillations appear in the atmosphere, especially in the temperature fields, having the predominant components of wave number 1 and 2 which would correlate with diurnal and semidiurnal wave components, respectively.