Abstract: Based on sea clutter real measured data of IPIX radar, the Rayleigh, Weibull, Log-normal and K-distribution are used to fit the distribution of sea clutter. It shows Log-normal distribution fitting the horizontal polarization to receive better and K-distribution fitting the vertical polarization to receive better, but there is still a situation that the sea clutter trailing region. In this paper, we assume that the Bragg scatterers in the sea clutter follow the K-distribution, and the discrete spikes obey the Log-normal distribution, the mixed distributions of the sea clutter as a whole obeys the K-distribution and the Log-normal distribution superimposed. A mixed distribution with closed expression is proposed, which improves the heavy tailing problem in fully polarimetric scattering characteristic sea clutter modeling. It is verified by the earl measured data that the mixed distribution has better fitting effect than Log-normal distribution and K-distribution.