Abstract: After a brief revision of the combination of semiotics and drama, the paper selects some classic musical signs translated by Ying Ruocheng in Amadeus. According to their roles played in Amadeus, the musical signs are grouped into the flowing 3 categories: establishing a character, establishing a mood, establishing a time or setting. According to the three categories, the paper analyses and appreciates the translation of musical signs in Amadeus. With a special perspective in appreciating drama translation, the unique charm of Mr. Ying’s translation is reflected.