〈鳳凰臺〉與〈萬丈潭〉二詩為杜甫自秦入蜀時寓居同谷所做，這兩首詩各以鳳凰與神龍為其象徵，多方結合各類典故並以獨特的手法開拓其意蘊。其中，鳳凰作為興國祥瑞之來歸君子，亦指胸懷大略的俊才賢士；神龍則為思為時用、隱居之賢才。而杜甫則以精采的故事情節，將象徵的內容設計成嚴密的詮釋網路，以富含暗示性的語詞激發聯想，坐實當地傳說等來賦予象徵更豐富的意義。 從此二詩在其象徵、造詞遣字、形式佈局及敘事摹景等方面皆以彼此補充或互為對比的層面觀察，我們可以說它們不但可被視為獨立的詩篇，同時也足以作為完成對方的文本。藉由這樣的同飛共舞，它們更深刻地表達了人對君主的不滿與對賢才失志的持續關懷，鳳凰臺、萬丈潭喻示了詩人之高志與深心，為其內心世界的縮影。

　　　　　The poems "phoenix Terrace" 鳳凰臺 and "One-Hundred-Thousand-Foot Deep Lake" 萬丈潭 were writtened by Tu Fu 杜甫 while he lived in Tung-gu 同谷. They use the phoenix and dragon as symbols and broaden their significance by the combination of various allusions and unique rhetorical methods. The phoenix represents the capable and virtuous people and hints at the rise of a new country. The dragon symbolizes the hermit who is willing to serve his country loyally. Through an involved plot, a tight network of interpretations, the use of words with rich associations, and the poetic realization of local legends, Tu Fu has mulitplied the meanings of these symbols. From the selecting of symbols, the wording, the structure, and their narration and description, we conclude that while these two poems can be read as independent texts, more can be gleaned from an intertextual reading. Together, these two poems convey the poet's disillusionment with the emperor and his lasting concern with the theme of neglected talent. They serve as a miniature of his inner world with "Phoenix Terrace" embodying Tu Fu's supreme ideal, and "One-Hundred-Thousand-Foot Deep Lake" his deep thought.