本文證明〈堯典〉、〈皋陶謨〉和〈禹貢〉三篇《尚書》文獻，其寫制的年代為西周中期。證明的過程是這樣的：一，將《討點》等三篇與可欣慰西周中期的《尚書．呂刑》篇進行對比；二，將〈堯典〉等三篇與可信為西周中期的金文如〈史牆盤〉、〈公盨〉等進行語言層面的對比；三，將〈堯典〉等三篇與可信的西周中期的《詩經》篇章對比；以上三方面對比的結果，都表明〈堯典〉等三篇為西周中期寫制的文獻。

This paper tries to prove that these three documents, including Yaodian (The Canon of Yao), Gaoyao Mo (The Counsels of Gaoyao), Yugong ( The Tribute of Yu), were completed in the mid-Western Zhou period. There are three points: first, this paper compares these three documents with Lvxing (The Regulation of Lv), which is convinced to be finished in the mid-Western Zhou period; second, this paper analyzes them by comparing their writing styles with those of some inscriptions on bronzes of mid-Western Zhou period; third, it compares them with some poets written in mid-Western Zhou period from The Book of Songs.