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In order to meet the requirement of studying the influence of hydrate distribution in sediment pores on the resistivity response of sediments from microscopic scale, the resistivity measurement system for sediments containing hydrate based on Computed Tomography(CT) was designed and developed, included the gas hydrate experimental simulation part, the resistivity measurement part and the CT scan part, and the resistivity and CT images during hydrate formation in situ were simultaneous monitored, the method was established of CT image processing and hydrate saturation calculation model optimization. The availability of the system was verified by methane hydrate formation experiment, the experiment showed that (1) Resistivity increased exponentially with hydrate saturation calculated from CT images; (2) When the hydrate saturation ranged between 17.13% and 30.72%, the saturation index is between 1.57 and 2.48 in Archie's formula. The measuring device provided technical support for further hydrate formation and decomposition experiments of different environmental conditions. The measurement system was used as data support for studying the influence of hydrate microscopic distribution on resistivity in pores and optimizing the hydrate saturation calculation model.