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Based on the self-designed equipment for measuring the electrical parameters of hydrate, the broadband electrical impedance of sea sand with tetrahydrofuran hydrate of different saturations was measured in the frequency range of 5Hz ~ 400 kHz. The broadband impedance characteristics of the simulated sediments during hydrate formation and decomposition were analyzed, and the dispersion characteristics of the impedance amplitude under different hydrate saturations as well as the quantitative relation between the impedance amplitude and saturation were discussed. A calculation model of hydrate saturation based on broadband impedance amplitude and Archie formula was established finally. It has been shown that: (1) the impedance amplitude of hydrate bearing sea sand system presents dispersion characteristics, which is affected by the interface polarization effect between the pore wall and fluid, and the relation between the impedance amplitude dispersion and hydrate saturation is approximately linear; (2) at the test frequency of 200 ~ 200kHz, the cementation index in Archie"s formula is stable and the relation between saturation index and logarithm of the test frequency is approximately linear; thus the test frequency should be used as a parameter of the hydrate saturation calculation model. This study provides a new method for the evaluation of hydrate saturation in sediment. By measuring the broadband impedance amplitude and applying the proposed model, it is expected to obtain a more accurate and reliable saturation value by integrating the model calculation results of multiple frequencies.