Abstract: In this paper some examples are given to show the fact that the large scale topography of the plateau exerts a basic influence on the local diabatic frontogenesis near 34°N. Adopting the concept of the large-scale heating field, one can find out suitable expression for a number of weather and climatic phenomena over the plateau, such as the frontal systems(especially, the warm fronts), the plateau cyclones(vortices), the origins of Chang Jiang and Huang He and the formation of Qaidam Pendi Desert. It is shown in this paper, that the diabatic process must be taken into account in the study of plateau meteorology and the surface analysis needs also to be improved urgently.