Abstract: In order to study the influence of the pore characteristics of tectonic coal and primary structural coal on the gas adsorption characteristics, we take Sanjia Coal Mine outburst hole tectonic coal and primary structure as the research object, use the combining methods of mercury injection and liquid nitrogen adsorption experiment method to study the pore structure of different structures of coal, and then combined with the Menger geometric model, we analyze different structure coal pore fractal characteristics, further elaborate the pore structure fractal characteristics of the impact of gas adsorption characteristics. The results show that: there is hysteresis loop in both primary structural coal and outburst hole tectonicl coal, and the hysteresis loop in outburst hole tectonic coal is obviously larger than that in primary structural coal. The fractal dimension of outburst hole tectonic coal are both greater than that of primary structural coal, and the porosity complexity of outburst hole tectonic coal is higher than that of primary structural coal. The porosity complexity of outburst hole tectonic coal provides good conditions for gas adsorption. The overall pore development of structural coal with outburst pores is better than that of primary structural coal, and the pore development at the stage of micropore and pore is much better than that of primary structural coal.