本文以孫楷第先生的《中國通俗小說書目》為研究論題，主要希望通過文字的論述、論證，指出：（一）陳寅恪先生在民國初年提出的治學的潮流－「預流」，除敦煌學外，同時也發生在小說等其他新興的學科領域。孫楷第先生在中國通俗小說領域的研究和成就，亦是治學「預流」之謂。（二）透過比對、論述孫楷第先生《中國通俗小說書目》的版本修訂，體現孫先生在治學上「擇善固執」的精神和文人心態的微妙轉變。（三）指陳孫楷第先生《中國通俗小說書目》的學術價值和學術意義。（四）《中國通俗小說書目》存有三種版本，相關出版社應該因應時代的進步，而作出相應的出版校正和編輯，使得《中國通俗小說書目》能為學林廣泛運用，而不是一昧地據舊本重印、加印。

This essay tries to refer that: firstly "Preliminary Current (Yu liu)" which was drawn by Chen Yin-que in the first years of Republic of China, is not a concept referring to Tunhuangology, it also happened in other newly rising fields, such as novel study. The achievements made by SUN Kai-di in the field of ancient Chinese popular novel study, is somehow a kind of "Preliminary Current". Secondly, comparing and analyzing the version revising of "Bibliography of Ancient Chinese Popular Novels", notify the spirit of "choosing and holding what is good" of SUN Kai-di, and the subtle change in his state of mind. Thirdly, the academic value and significance of Sun and his bibliography will be evaluated. Fourthly, There are three versions of this Bibliography. The publishing houses should keep revising and editing along with the progress of time, rather than printing the old versions, so that it could be widely used.