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A new 2-D sea-wave model is proposed by combining Longuet-Higgins sea model and normalization band-limited Weierstrass- Mandelbrot (WM) fractal sea model.With this model,the spatial autocorrelation function is calculated and the directional sea spectrum derived by taking its two-dimension Fourier transform.The spectrum is validated by comparing it to the common spectra of Pierson-Moskowitz and JONSWAP and to real data of the South China Sea.Angular distribution function is very similar to the Mitsuyasu model.A closed-form expression of the scattering coefficient is derived based on the Kirchhoff approximation.We analytically demonstrate that the electromagnetic(EM) sea scattered signal retains certain fractal properties of the sea surface and the fractal dimension of the EM signal scattered from a sea fractal surface belongs to [1,D-1],where D is the dimension of the sea surface.