本文於《文心雕龍•原道》之涵義，及全書所用「道」字之義，詳加辨析，證明「原道」之「道」，為「自然」之義，指形上之本體，宇宙萬物之根源，在本書中具特殊涵義，為專門術語。劉勰推源文章本於「自然」，作為其文學理論之超越根據，並為其衡文標準，為第一要義。其餘「道」字意義，則可分為九大類別。

My proposal provides for the meaning of all the word of 'truth' in "wen shin tiu loan • original truth", that's testified to belong to the Heavenly things, the metaphysical subjectivity, and the origin under heaven, so as to become a specific term in the book. Liu Si derived the Chinese classics from the Heavenly things with which he made to be a subjectivity of his lit theory, a level of his criticizing, and as the first principle. The other principles came to the nine points.