Coal beds are not just sources of coal-bed methane, but also act as reservoirs for it. The desorption of methane from coal beds is influenced by various factors, with reservoir characteristics being crucial. Factors like pore structures, permeability, pressure, depth, temperature, water content, coal type, and microscopic components of coal rock all impact methane desorption. Understanding these factors can help in studying the desorption process and extracting coal-bed methane efficiently.