This paper addresses the practice and experience of teaching dramaturgy of Chinese dramatic arias. During the course, students are guided to revise their plays for production by means of comparing different versions. By a close-up examination of the traces of modification, they learn to discern the playwright's implications of the revision and acquire dramaturgical methods through the process. This paper provides three examples: (1) a comparison between different versions of the same play, exemplified by Chen Yaxian's first to final drafts of his new Peking Opera play Cao Cao and Yang Xiu; (2) a comparison between different versions of the same play revised by different playwrights, exemplified by Yanluo meng (Journey through Hell), a.k.a. Tiandi-Xiucai (Heaven and Earth-the Cultivated Talent), a Peking opera play first created by Chen Yaxian and later revised for production by me; (3) a comparison of the same play adapted to different Chinese opera types, exemplified by the Puxian and Peking opera respective adaptations of Chuncao chuangtang (Spring Grass Intruding on the Court) with a thorough examination of how Fan Junhong, the author of the Peking opera adaptation, refined and amplified the structure of the original Puxian opera version created by Chen Renjian.