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Using visual experimental apparatus,one system(T40,1×10-3 mol/L,nonadded with coal)and another system(T40,2×10-3 mol/L,added with coal)were experimented with for three times and two times.respectively.Five groups of P-T experimental parameters were obtained using the data logger system and analyzed combined with the video information of the experiments.Maior conclustions show that the induction time is shortened by 10-20 times in the experimental system containing residual pentahedral ring structures;“memory effect”can accelerate the dynamic progress and improve the thermodynamic conditions of gas hydrate formation.