bib

\documentclass{ctexart}
\usepackage{etoolbox}
\pretocmd{\bibliography}{
  \bgroup
  \ctexset{
    section = {
      format = \bfseries\Huge\raggedleft
    }
  }
}{\typeout{pre succeed}}{\typeout{pre fail}}
\apptocmd{\bibliography}{
  \egroup
}{\typeout{app succeed}}{\typeout{app fail}}
\begin{document}
\section{测试}
\cite{article-full, article-minimal}
\bibliographystyle{plain}
\bibliography{xampl.bib}
\section{测试2}
\end{document}