Sea clutter often restricts radar to detect target. The accuracy of the radar performance assessment is related to accurate simulation of sea clutter. The amplitude distribution of sea clutter is introduced first in this paper. Then this paper discusses the features of temporal and spatial correlation. And a simulation method based on spherically invariant random process was proposed. Finally, results show that the clutter data which is obtained by the method is K distribution and spatialtemporal correlation is satisfied. This method is joint with the composite scattering mechanism and is feasible