Franz Liszt(1811-1886) is one of the representative composers of the Romantic period. He is praised for his gorgeous and dazzling piano playing, not only at this time but also influencing many modern musicians. Liszt also created the musical form of symphonic poems(Sinfonische Dichtung), which strengthened the connotation of music and provided an opportunity to integrate music and literature.

The vocal music composed by Liszt is often ignored because of his piano accomplishments, and he has composed one of the few vocal song cycles in his life, composed of sonnets by Petrarch as the lyrics. From these songs, we can see how music and literature make a perfect combination.

Combining Liszt's life of love and Petrarch's thoughts, these two men have crossed hundreds of years of association, giving birth to the beautiful and profound "Tre Sonetti di Petrarca" that has been handed down to these days.

This thesis is based on "Tre Sonetti di Petrarca," from the life of Petrarch and Liszt, also from the perspective of humanism to cut in the music and literature in the works. The first chapter contains the purpose, motive, scope, and methods of the research; the second chapter integrates the development of the lieder; the third chapter discusses Liszt's life background, composition style, and influence on later generations; the fourth chapter discusses Petrarca's life background, humanism and influence on later generations; the fifth chapter analyzes the three works of "Tre Sonetti di Petrarca" from the poetry, metric, and musical styles; the sixth chapter is the summary.