Tolerance ethics in criminal procedural law is a mercy concept which is followed by the specialized agencies of the state and embodied through conditionally applying to lenient procedure, so that the suspect or the defendant will not be prosecuted or will be given lighter punishment. Tolerance ethics differs from justice ethics, and has its own independent and irreplaceable value. To advocate the tolerance ethics in criminal procedural law is a necessary requirement of value relativism philosophy and context of value diversity, an internal requirement of modesty concept and a basis on which the harmony idea could be realized.