Sea ice clutter was measured using an X-band radar which is located at the city of Mombetsu in Hokkaido. The pulsewidth of the radar was 80 nsec. To sample by 40 nsec and record digitally, an emitter coupled logic (ECL) was used as a high-speed IC. The sampled data were first transferred to 64 Kbyte dynamic memory board and next to a 5 inch floppy disk through an 8 bit micro-computer. These data were processed by a 16 bit micro-computer. As a result, it is shown that the amplitude of sea ice obeys a Weibull disturibution with shape parameters of c0.50 to 1.65. Thus, the amplitude statistics deviate from the well-known Rayleigh distribution of c2.0, in which a logarithmic/constant false alarm rate (LOG/CFAR) circuit is useful. Therefore, it is concluded that the new Weibull/CFAR should be considered to suppress sea ice clutter.