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The paper introduce the propagation characteristics of Loran-C underwater and calculate the H-field and E-field, then get the result that using the H-field antenna is the best way to receive Loran-C signal underwater. The key of receiving signal underwater is the detective resolution of circuit, and the propagation depth of H-field and E-field changing with the detective resolution of circuit is analyzed. The induction voltage of H-field antenna is calculated in experiment. The result indicate that position (with the depth is less than 10m) with Loran-C signal received by H-field antenna underwater is feasible.