Abstract: The right to silence is the right that the suspects and defendants enjoy when facing the judiciary's interrogations ,when they cannot verity his or her crimes during the criminal litigations . This system originated from England, then was accepted gradually by most of countries and many international law documents . Its ethical foundation lies in that the right to silence reside in the freedom of speech, and what's more, we should treat the suspects and defendants as the equal social subject. Today ,our cou...