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To meet the requirement of evaluating the saturation of natural gas hydrate in marine sediments, a new method based on segmentally-coated TDR probe was proposed for simultaneous measurement of the dielectric constant and conductivity of sediments. Finite element models were established for uncoated probe, fully-coated probe and segmentally-coated probe, respectively, to simulate the TDR measurement responses. The influences of coating parameters on the measurement performance of dielectric constant and conductivity were investigated numerically. The segmentally-coated TDR probe was then applied to the measurement of hydrate-bearing porous media and the measurement errors were analyzed and corrected. It has been shown that: the thickness and dielectric constant of the probe coating directly affect the attenuation of the collected voltage signal, thus it is necessary to optimize the design according to the electrical properties of the measured medium; under the condition that the coating thickness and dielectric constant are determined, the conductivity measurement range of the probe can be adjusted by varying the gap length of segmented coatings; for the measurement of inhomogeneous media, the accuracy of conductivity measurement can be improved by increasing the number of coating gaps; for the measurement of porous media containing hydrates with segmentally-coated TDR probe, it is necessary to correct the errors induced by the coating.