Analyze the necessity of developing navy gun guided projectile, emphatically discuss some key technologies in developing this kind of projectile such as anti-overload, collectivity miniaturization, range-extending, guidance, warhead and ammunition-gun compatibility. Three ways to developing navy gun guided projectile are also put forward: laser semi-active, GPS/INS middle guidance and image terminal guidance, infrared/millimeter waves combined guidance. The research can provide effective reference for development of navy gun guided projectile.