Aimed at the problem that the ominidirectional sea-wave spectrum of fractal sea-wave model could not satisfy the positive power law when spatial wave numbers is smaller than the fundamental wave number, a 2-D sea-wave model is proposed by combining statistical sea model and normalization band-limited Weierstrass-Mandelbrot fractal sea-wave model. Sea surfaces of statistical model, classical fractal model and the improved model are compared. Electromagnetic scattering coefficient of the improved model based on the Kirchhoff approximation is derived. The angular distributions of incoherent scattering intensity coefficient of statistical model, classical fractal model and improved model are compared, and incoherent scattering intensity coefficient of improved model is analyzed based on different frequency and wind direction in microwave band. Analytical results show that sea surface have both characters of large-scale turbulent waves and micro-scale capillary wave and the electromagnetic scattering of improved model can comply better with the practical situation of sea surface.