Chapter one briefly describes I- Shan Yuan's birthday,family background, education and literary work. From hisopinion concerning discussion of poems, we can conclude aword, "cheng" (誠). He emphasizes " tien jan" (天然) and "chenchun" (真 淳) are the best performance of poems. Chapter two analyzes each peom in I-Shan Yuan's "Lunshih chueh chu san shih shou (論詩絕句二十首) " by form,composition, style, mood, character, skill, words andarrangement to conclude his opinion concerning discussion ofpoems. Chapter three superficially explores I- Shan's discussionabout elegance and vulgarity of poems. From poem twenty-third in "Lun shih chueh chu" (論詩絕句) and twenty-ninerestrictions in "Shih wen tzu ching", (詩 文自警) we canundersand what will be the unelegant work. Also from form,content, words, skill, position, style, attitude, we can know hisopinion concerning elegance and vulgarity of poems. Chatpter four investigates elegance and vulgarity of I-Shan's poems. From the criterion of I- Shan's opinion ofpoems, we can evaluate if his poems meet the request ofelegance. This chapter divides I-Shan Yuan's writing processinto three periods, then qppreciates his eight works, "Chishan" (箕山), "Yin chiu" (飲酒), "Chiu tsan" (秋蠶), etc. to knowthese are all elegant works. Chapter five describes the elegance and vulgarity ofpoems. Focusing on the theory of poems mentioned by peopleof former times and elegance mentiond in I-Shan's poems, Iquote Shih-Lung Hsu's (徐世隆) word: "Hao-Wen Yuan (元好問 ) can use vulgarity for elegance, change old into new,really get the perfection from the senjor." From Hsu's word, Idiscuss "the difference between elegance and vulgarity", "usevulgarity for elegance" "change vulgarity to new", "referencematerials" are the essence of the rnie of poems, "Elegance isbetter than vulgarity." Chapter six, conclusion, positively appreciates thecontribution of I- Shan Yuan's "Lun shih chueh chu" inresearch of poems and poet's works, also knows he advocatespoems should have "chen" (真) and "shen" (神), and these areform "cheng" (誠). He also unites art of poems with chen (真)and cheng (誠) to meet Confucianists' traditional esthetics."Cheng" (正) is the basis of "chi" (奇), "chi" (奇) is the changeof "cheng" (正). These are the essence of "Lun shih chuehchu".