Abstract: To elucidate the gas emission characteristics and influencing factors of gas-bearing coal under fracturing fluid inundation, this study systematically investigated the gas desorption law of coal particles under different inundation durations and adsorption equilibrium pressures using a self-designed experimental apparatus for atmospheric pressure water inundation and gas desorption. The results indicate that coal particle inundation behavior can be classified into two modes: "quasi-inhibition desorption" and "inundation desorption". Short-term inundation （10 minutes） resulted in a weak water-blocking effect, short desorption termination time, and total desorption volume close to that of dry coal samples. In contrast, longer inundation durations （60 minutes and above） significantly inhibited gas desorption, with prolonged desorption termination time and markedly reduced total desorption volume. Nuclear magnetic resonance analysis revealed that the water intake in mesopores is the key factor determining the desorption mode, while micropores rapidly saturate under short-term inundation, with the water absorption state of mesopores dominating the desorption behavior. Additionally, higher adsorption equilibrium pressures required longer minimum inundation durations, and secondary desorption phenomena became more pronounced, with desorption predominantly occurring during the 2nd to 3rd days after removal from inundation. This study provides a theoretical basis for the management of piled coal gas and the optimization of water inundation measures in underground coal mines.