Abstract: It deals with the vivid causes of the role-maying genre of masculine female and feminine male in Cao Yu's early dramas and mays from the inner aspect by using the concerned Anima and Animus theories in Karl Jung psychoanalysis.It is thought to be the results of the actions caused by the heroes' Anima and heroines' Animus as well as the cast of the Anima and Animus psychoanalysis prototype. Meanwhile it can also be sourced in Cao Yu's Anima temperament in himself.