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This letter addresses the feature detection design for the target embedded in sea clutter. Three polarization features (the relative surface scattering power, the relative volume scattering power, and the relative dihedral scattering power) are obtained based on the observed multipolarization channel returns. Then, 3-D feature detector is constructed to detect the sea-surface small floating target based on the three polarization features. The experiments based on the measured radar data show that the proposed method attains better detection performance and better robustness than do several existed feature-class detectors.