Wolfgang Amadeus Mozart, one of the most important composers in the classical period, wrote more than 600 instrumental and vocal works in his life. Among many musical works, besides the well-known symphonies and concertos, his 22operas had a far-reaching impact on later generations. During his settlement in Vienna, Mozart co-wrote with theatre poet Da Pent. Three famous comedy operas, the last one is Woman's Heart, completed in 1790. This paper takes Feudiligi's aria "Hard as a Rock" in Mozart's opera "Woman's Heart" as the object of study, through in-depth analysis of the creative background, Lyric characteristics and musical structure of the work, and summarizes the singing characteristics of "Hard as a Rock". With a summary, I hope to put forward the theoretical basis for the singing of the same type of songs, and summarize the corresponding more optimized learning methods.