唐初劉知幾私撰《史通》，多譏往哲，喜述前非，不僅破棄墨守，且又挑戰典範。本文就史家之經學觀、詩化之史學觀二方面，評價劉氏之《左傳》學，得出下列結論：一、《左傳》以史傳經，學者苟欲觀「善惡必彰，真偽盡露」之實錄，當求之《左傳》；若尋之《春秋》，則「實乖此義」。二、《左傳》為「敘事之最」，「信聖人之羽翮，而述者之冠冕」；劉氏往往據以權衡《春秋》與二傳之是非得失，所謂「《左氏》之義有三長，而《二傳》之義有五短」者是。三、劉氏極重視歷史文學，楬櫫「尚簡」、「用晦」諸歷史語言，要皆詩歌語言之圭臬；而存真、實錄，則又介乎詩史之際。四、為振救史學之流弊，《史通》標榜敘事之簡要，所謂華逝實存，文約事豐云云，《左傳》敘事多有具體而微之體現。五、又楬櫫用晦之道，大抵關涉史料之取捨別裁，語言之經營安排，可以凸顯詩學特徵，可以強化美感效應，蓋合形象美、含蓄美、簡潔美而一之。六、劉氏受唐初史學影響，主張實錄直書，期許歷史敘事如明鏡照人，虛空傳響，真實呈現，無所遁隱。推崇《左傳》「言事相兼，煩省合理」，其童謠俗諺、城謳於誦，固溫潤素美，非經琢磨筆削；其外交詞令，行人應答，更微婉多切，流靡而不淫，是樸拙典雅，並傳其真。至於敘事傳人，擬言代言，亦多歸於史學存真之要求。

Early Tang Dynasty Liu ZhiJi (劉知幾) Privately published Shi Tong (史通), almost ridiculed the former philosopher and criticized their right and wrong. Liu not only discarded the norms but also challenged the model. This article accords to views of the classics of historians and the views of the historiography of the poeticization to evaluate Liu's ZuoZhuan (左傳) study. We gets the following conclusions: first, Zuo Zhuan explained the classics with the history. If scholars want to know the record of "Good and evil show up, real and hypocrisy display fully.", should seek Zuo Zhuan. Chun Qiu (春秋) is not justice. Second, Zuo Zhuan is the best narratives. Indeed enhance and glorify the theory of saints, the most important writings of three Zhuan (三傳). Liu often Commented Chun Qiu and GongYang Chuan (公羊傳), GuLiang Chuan (穀梁傳) by Zuo Zhuan. Zuo Zhuan has three advantages, GongYang Chuan and Gu Liang Chuan have five disadvantages. Third, Liu paid attention to the literature of the history very much. He advocated various historical language of "advocating simple and clear "and" implicitness". Those are standards of the poetry language. To show real and the record are between the poetry and the history. Fourth, to save the historic defects, Shi Tong declared the narrative summary, that is, although the flowers disappeared, fruit stayed. The text was simple but its meaning was rich. Zuo Zhuan's narratives liked that. Fifth, advocating the way of using implicitness, probably involved in the selection of other historical materials. Management arrangements of the language could show the poetical characteristics, strengthen the aesthetic effect. That combined the beauty of image, implicit and brief. Sixth, Liu was affected by the historiography of the Early Tang Dynasty, claiming straight record, expecting historical narratives to show real. He respected Zuo Zhuan "To record dialogue with the events described in balance. No matter the length of articles devoted all right." Everyone recited the vulgar. That's moderate and moving, not specially modified. Foreign words were fluent and elegant, only made a show. As for narrative biographies and alternative historian's words, just attributabled to the requirements of the true history.