In order to enhancement the stealth capability of ship electric fields, the similar characters of ship electric and magnetic fields produce mechanism were studied. The similar effect characters to battle effectiveness of ship electric and magnetic fields were analyzed. The communicate theory of ship electric and magnetic fields were researched. The similar characters of analytical methods and stealth technology strategy of ship electric and magnetic fields were discussed. It is shown that the stealth technology between ship electric and magnetic fields is similar and the research can be developed by the same methods and the same experimentation.