The four professions of opera are life, morality, cleanliness and ugliness.

The roles and characteristics of being clean and ugly are different.

Life is divided into wusheng, laosheng, xiaosheng and doll life.

Dan is divided into Zhengdan, Hua Dan, Laodan and Wudan.

The net can be divided into three categories: positive net, auxiliary net and wujing.

Ugly deeds play negative characters, but also play positive characters.

生旦淨醜是京劇的四大行當。