Abstract: Through analysis of the relative position between the borderline of radar coverage and the height of digital terrain,the correction arithmetic of radar coverage influenced by complicated terrain was proposed,which is based on the principle of geometrics optics．Finally,the correction of radar coverage in complicated terrain was realized,which uses the propagation attenuation theory of the radar electromagnetic wave,the method of mixed sampling and the correction arithmetic．The result of experiment shows that this method not only is efficient for the complicated terrain,but also can make the visualization lifelike.

Key words: Radar coverage,3D visualization,Correction arithmetic,Digital terrain