The temporal correlation characteristics, spatial correlation characteristics and the amplitude statistics of the measured sea-clutter data with the grazing angle from 44° to 69° were studied. Experiments showed that correlation time of sea clutter was maintained in the order of milliseconds, which increased at first and then decreased with the increasing of the grazing angle, and the strongest correlation time appeared at about 60°.At the same time, the average number of correlation distance units increased with the increasing of the grazing angle. Hybrid distribution, a new sea clutter amplitude fitting distribution, was proposed according to the amplitude statistics. Contrast test was made to the new distribution with such distributions as KK distribution, Rayleigh distribution, lognormal distribution and K distribution. The result shows that the new hybrid distribution has fine fitting effect to the sea clutter with large grazing angle, especially to its tailing characteristics.