Abstract: In order to promote mine gas hydrate formation quickly, which can prevent coal and gas outburst, the processes of gas hydrate formation in three reaction systems containing coal were investigated by utilizing the visible experimental installation under the condition of 14.3-25.4℃ and 18.66-26.70 MPa, and the correlations among pressure, temperature and time were obtained. Experimental data were analyzed based on the computation models of formation rate and volumetric proportion. The results show that the addition of surfactant shortens induction time and improves formation rate and volumetric proportion, and the volumetric proportion of synthetic hydrate samples can amount to 136-150; the existence of porous medium (coal) delays hydrate formation exiguously; the influence of memory effect on gas hydrate formation is notable, the induction time could be shortened by 10-20 times for the experimental system containing residual pentahedral ring structure.