Abstract: As a potential alternative energy source, gas hydrate has attracted more and more attention with the breakthrough of mining technology. However, there are many obstacles to large-scale mining of such enormous potential resources. Due to the complicated environment of marine gas hydrate. High technical requirements for drilling and cost so much, pre-production needs careful carefully. Experimental research on various mining techniques in the laboratory, and discuss the applicable conditions, technical parameter, advantages and disadvantage of various mining techniques, these provide the reference for the actual development and utilization of gas hydrate, is undoubtedly the most economical and effective way. Therefore, from the simulation experiments of gas hydrate formation with various components, verifying the forming conditions and influencing factors. And then quantitatively evaluate the gas hydrate decomposition experiment, including three mining techniques, methanol injection method, step-down method and thermal excitation method, which affect the decomposition law, influencing factors and decomposition rate.