Abstract: After World War II，the south of America encountered serious moral deterioration.Southern writers aimed their criticism to social and family ethics.O′Connor，a southern woman writer created a lot of religious lunatics from a unique irrationality perspective.Those mad men，aiming at improving the degraded moral，challenged the deceptive and indifferent God and religion by their own experiences.The basic characteristics of them can be summarized as antiGod，violence and moral vanguard.Their ethic values and crazy behaviors reflected O′Connors understanding of social and religious beliefs in American south：Catholicism is the only cure for the moral deprived southern society.

Key words: O′Connor, moral ethics, religious lunatics, paranoia, violence