XuanZang who was monk of Tang dynasty was very famous person. In 7th century XuanZang went to the west to bring Buddihist scripture to the china. He went around over one hundred countries for seventeen years. His miraculous story carried down for long time. Yuan Zaju 「Journey to the West」 was created at these foundation. Tang Seng is hero in Yuan Zaju 「Journey to the West」. In this drama Tang Seng play double roles. One is mythical and heroic character. The other is humouros and common character. In this drama birth of Tang Seng is very mythical. Tang Seng in one month is swept away in river. He is saved by another monk. Because of this the image of Tang Seng is filled with myth and hero. On the other hand in this drama Tang Seng has humorous and common character. In this drama one common country woman sneer Tang Seng. In this point Tang Seng is target of ridicule and satire. Also Tang Seng way to the west is kidnaped by monster. In this point Tang Seng is an incompetent man. In this drama Tang Seng play double roles. Double roles conflict each other. what element produced these opposed two characters? This is antinomy. Unity of Three Religion is significant element. At that time Unity of Three Religion is general tendency. Yuan Zaju 「Journey to the West」 is influenced by the Unity of Three Religion. Addedly the writer of Yuan Zaju 「Journey to the West」 concerned in stage effect.