This thesis is based on the Beiguan Old style theater Pantaohui which performed in Liu Kuan Yu''s graduate recital. The collection and analysis of the original sources of two main characters in Pantaohui, which named Sun Wu-Kong and Erlang Shen, are presented. Moreover, the introduction of traditional folk legends which related to Beiguan Old style theater Pantaohui is also revealed in this paper. The author compares the script of Pantaohui which imparted by the Beiguan master Chan, Wen-Tsan as an illustration with the script from the Beiguan scripts in Taiwan Episode 3 (arranged by Chen Xiu-Fang) and with the version performed by Zhu-Qian Beiguan Theatrical Troupe. The analysis of music patterns which have been used in Pantaohui, such as Liushui, Jinban, and Jinzhongman, is also provided in this thesis. Special attention is given by the author to the interpretation of the melo-metric tune sing by singer and the music feature played by K''o-tsai Hsuan player.