Christiane Nord put forward “Loyalty Principle” on the basis of functional skopostheori in order to account for the culture-specificity of translation concepts,set an ethical limitation to the otherwise unlimited range of possible purposes for the translation of one particular source text,and propose a negotiation between the translator and other partners in the translation interaction so as to correct the radical functionalism.In order to display a comprehensive picture of the praise and criticism on “Loyalty Principle”,this paper aims to explain the principle in terms of translation ethics,focusing on its connotation,contribution and limitation to translation studies.