Topography is an important external forcing factor on the atmosphere and has orographic thermal and dynamic impacts on the evolution of atmospheric long waves and the emergence of extreme weather. In this study, numerical calculation with the forced β plane quasi-geostrophic potential vorticity equation considering linear Rossby waves with and without the influence of basic flow is used to investigate the possible impacts of topography on the adjustment of long waves. The results show that without the basic flow, the phenomenon of long-wave adjustment was accompanied by the forcing of zonal nonuniform topography, which is also an important mechanism for the adjustment. The adjustment is closely related to topographic amplitude and zonal structure. As the amplitude of topography increases, the phenomenon of wave-number adjustment in the evolution of linear Rossby waves becomes more obvious. However, the adjustment is difficult to identify in topography with a high zonal wave number. Long-wave adjustment is also associated with latitude. High latitude relates to a low β value in which the influence of topography is strong and adjustment of the wave number is simple. On the contrary, the wave number of a linear Rossby wave with a large β effect in low latitudes is not easily changed. Long-wave adjustment is associated with the structure of the initial field and is not sensitive to the amplitude of the initial fluctuation. Moreover, when the basic flow is considered, the forcing of topography is also an important factor in producing a solitary Rossby wave. The structure of this solitary wave is determined by the distribution of the topography and is independent of the structure of initial fluctuation.