Radar stealth can be said to be the highlight of surface ship stealth. According to the calculation, the RCS of surface ships is reduced by 10dBsm, the reflected energy of radar waves is reduced by 90%, and the maximum distance detected by radar is correspondingly reduced by 44%. When the RCS is reduced by 13dBsm, it is equivalent to the reduction of ship shape by 45; When the RCS of a destroyer with a displacement of about 4,000 tons is reduced by 1.5 dbsm, its signal on the radar screen is only equivalent to a 400-ton patrol boat.