In its preface written in kanbun (Sino-Japanese), styles of waka are classified into ten: the "koka" (old poem) style, the "shinmyo" (mysterious) style, the "jiki" (direct) style, the "yojo" (suggestiveness) style, the "shashi" (reflecting thoughts) style, the "kojo" (elevated emotion) style, the "kiryo" (good-looking) style, the "hikyo" (witty) style, the "kaen" (splendid fascination) style, and the "ryoho" (paronomasia) style.
その漢文の序において、和歌の体を「古歌体」・「神妙体」・「直体」・「余情体」・「写思体」・「高情体」・「器量体」・「比興体」・「華艶体」・「両方体」の十種に分類している。