自遠古時期，就有以復讎的方式來實行法規，由復讎不但可由此觀察社會的面向，而也代表著禮和刑、孝道、道德與法律之間的衝突。本篇論文是藉由唐宋時期的復讎案例與法律規定，及其實際審理的過程與討論，來彰顯唐宋的法律特色及其間的轉變。 根據唐宋律對復讎的相關規定與實際審理的案例來看，法律的規定雖然嚴格，但實際審理案例的狀況則有所差異，甚至多有矜免之舉，而案例亦嘗引起朝臣的不同意見的討論，這些都是由於儒家的孝道思想與法律的衝突所致。而在案例中，宋代的復讎者僅有一位為妻復讎者被判死刑。唐代則有數例，由此可見，由唐至宋，復讎者的判罪也漸趨寬弛。

In ancient china, law enforcement originated in vengeance. We could not only observe the attitude of society but the conflict of penalty, filial piety, morality and law by the behavior of revenge. This article wants to reveal the character and developing of law in T'ang and Sung dynasty by discussing the practical cases and judicious process of revenge. According to the law and trial cases in this period, there still existed some difference although the attitude toward revenge was almost the same strict. Officers sometimes even disputed on different opinions, these arguments were caused conflict between filial piety and law. For example, only one person was executed to death in Sung but there were some in T'ang dynasty. From T'ang to Sung, trials toward revenge were getting exempt and lenient. The Sung emperors frequently granted such pardons, but their importance was overshadowed by the more general grants of mercy.