凌廷堪在《燕乐考原》中对南北曲的宫调体制作了考证,探讨了南北曲九宫和十三调的来源与流变的过程,对九宫与十三调分立之说作了辩析与批驳。《论曲绝句》三十二首,则以诗的形式,逐一对戏曲史上自关汉卿到洪升的三十余位名家作了点评,表达了自己的戏曲主张。 Ling Tingkan made a research on Gongyuan of North and South Songs in “Yan Lok Kao Yuan Yuan”, explored the origins and changes of Qujiu and Thirteen Tunes of Nan Qu and North Dynasties, and defended the origins and changes of Jiugong and Thirteen Tunes Analysis and criticism. “On the quatrains” thirty-two, then in the form of poetry, one by one on the history of the opera from the Guan Hanqing Hongsheng made more than thirty famous writers commented, expressed his own drama advocate.