Ge Gu Liao Qin has been prevailed for ten hundreds years, and detective fictions of Ming Dynasty took it as a model and developed the belief of scapegoat to saving others with self-sacrifice to reflect the belief tendency of filial piety. The transformation of sacred filial piety from folk therapy had reflected the complexity of the culture of Ge Gu Liao QinMoreover, worldly rewards to goods with official flags were combined to create the thought that filial piety conformed to natural laws and humanity. Legal cases used official flags to represent the response to behaviors which violated the Classic of Filial Piety and used filial piety to represent affirmation of natural laws so as to admit the practicing method of Ge Gu Liao Qin and shortened practical distance between ideal models and actual standards with stories and figures to realize the effect of persuading readers, thus reflecting the positive significance of reconstruction of ethical orders of detective fictions