Abstract: Based on Functionalist Translation Theory,this paper reinterpreted the connotation of "Xin Da Ya" from the perspective of Skopostheorie.According to the specific history background and translation of Evolution and Ethics and Other Essays,the author revealed that "Ya"(elegance) was the real center governing "Xin"(faithfulness) and "Da"(expressiveness)."Ya" is not the "superficial language polishing" or the "cosmetic powder" for translation.Skopos rule has endowed "Ya" with the key position while Yan Fu's tra...