Different rank coal has different impacts on coalbed gas enrichment. Factors like coal seam conditions, tectonic events, and hydrodynamic conditions affect gas concentration. High rank coal yields more gas due to absorption ability and gas content. Tectonic uplift increases permeability, affecting gas migration. Tectono-thermal events generate gas and alter coal reservoirs. Hydrogeological conditions influence gas preservation and generation in low rank coal. These factors control the enrichment of coalbed gas in diverse rank coal, leading to pool formation. Different evaluation methods and mining technology are needed for exploring different rank coalbed gas.