As the core concepts of western drama theory, three unities is regarded as the golden rule of tragic creation in classical. It makes the literary and artistic creation full of cool and dignified temperament in seventeenth century. The analysis of article is divided into three aspects. First of all, it aimed to analysis three unities of the society perspective in classical for comprehensive the theoretical connotation. Second, though two classic works of literature and art for express the three unities. Finally, it makes the comprehensive interpretation for the meaning of three unities.