After I change my biblography to IEEE style (usepackage[style=ieee,backend=biber]{biblatex} and printbibliography[title=Bibliography]), the words in the biblography becomes smaller, so my advisor asked me to adjust it back.
I have searched for the solutions, but none of them works.
{footnotesize
bibliography{bibfile}}
and renewcommand*{bibfont}{normalsize} : no effect, the words are still small.
natbib method (defbibfont{normalsize}) : unexpected and ungooglable error message was reported.
beamer method : since there is already a document class, so I cannot use it.
My thesis must be compiled with Xelatex→Biber→Xelatex→Xelatex. I use Texworks in Tex Live.