This paper deals with the application of the method of petroleum reservoir-forming dynamics in the study of the coalbed methane reservoir-forming dynamic mechanism in the southern Qinshui Basin. On the basis of an analysis of the thermodynamic field, stress field and hydrodynamic field, the authors suggest that there are favorable conditions of hydrocarbon generation and accumulation in the area. The groundwater hydrodynamic field in the southern part of the Jincheng mining district is a catchment area. The existence of such a groundwater hydrodynamic field led to the concentration of coalbed methane and accumulation of energy of groundwater and fluid in coalbeds. The accumulation of such energy is the basis and guarantee for the formation of high-pressure reservoirs. This part is also characterized by lower stress and higher permeability and thus is rich in coalbed methane and has a high coalbed methane productivity. So it is the most favorable area for coalbed methane exploration and development. But there is a groundwater hydrodynamic field with an unidirectional flow in the northern part of the Jincheng mining district. Thus there appear different coalbed methane reservoir-forming characteristics in the same area under the same geologic setting.