Abstract: Kriging algorithm is a kind of linear optimal and unbiased interpolation estimation method for the values of a regionalized variables in the statistical sense. This paper analyzes the principle of Kriging interpolation and the method for determining variogram. Shortwave communication available frequency at sea measured data are interpolated using Ordinary Kriging algorithm,a new shortwave communication available frequency interpolation method is proposed.and the feasibility and effectiveness of the method by measured data simulation are verified. It is valueable for the shortwave communication available frequency selection at the sea.