Abstract: “System-ethic” is a word that should be standardized in the researching field of ethics.It pays close attention to the practice of social life and is becoming a new area in modern ethics.“System-ethic” realizes the agreement between ethical “should be” and “be” between ideal and reality.The construction of system-ethic becomes a practice request for clearing up the ethic-crisis of modernity.

Key words: system-ethic, Hume&rsquo, s question, ethic-crisis