Yishan's poems are famous for their "untitled" words, which have obscure meanings, or entrust politics or involve emotions, and the lawsuits are varied. This book draws lessons from many scholars, with notes and comments, and makes a relatively complete appreciation and evaluation of Li Shangyin's untitled poems. It is also accompanied by a biography, a chronicle and several papers. It is really a rigorous academic work. Yishan's poems are elegant and sentimental, and "untitled" poems are the most worthy of appreciation.