Abstract: Indoor simulated measurement is a valid means for study of sea clutter and target’s scattering characters undersea-background. Applying the range gating method, the simulated measurement of sea clutter are carried out in the wave tank,where the sea wave are built artificially. This method can eliminate the affection caused by the wave tank’s bank, the antenna’ssidelobe etc. And the scattering coefficient and Doppler echo measured in wave tank are consisted with the data in the real seaenvironment