The thesis mainly discusses:
1.Background of Puccini: his biographic sketch, education, style of composition and creative background of 《Tosca》.
2.Musical elements of two tenor Arias, <Recondita armonia> and <E lucevan le stelle>.
3.Contrast and interpretation of CD recordings of Luciano Pavarotti, Placido Domingo, Jose Carreras and Carlo Bergonzi.
4.And lastly the key points and opinions on vocal performances made by various performers, which provide valuable technical skills on performing the above two Arias.