本文从法的溯及力概念入手,追溯了法溯及既往的历史传统,明确了法溯及既往理论在当代法治社会建设中的意义,以期该原则在我国法治实践中得到应有的重视。 This article begins with the concept of retrospectiveness of law and traced the historical tradition traced back to law. It clarifies the significance of the retrospective and past theories in the construction of contemporary law society, and hopes that this principle should receive the due attention in the practice of law in our country.