Untitled

\documentclass{beamer}
\usepackage{ctex}

% theme
\usetheme{Berlin}
\usecolortheme{dolphin}

% config
\setbeamertemplate{footline}{%
  \leavevmode%
  \hbox{%
  \begin{beamercolorbox}[wd=.5\paperwidth,ht=2.25ex,dp=1ex,center]{author in head/foot}%
    \usebeamerfont{author in head/foot}
    \insertshortauthor
  \end{beamercolorbox}%
  \begin{beamercolorbox}[wd=.5\paperwidth,ht=2.25ex,dp=1ex,center]{date in head/foot}%
    \usebeamerfont{title in head/foot}%
    第 \insertframenumber{}页/共\inserttotalframenumber 页\hspace*{1ex}
  \end{beamercolorbox}}%
  \vskip0pt%
}

\title{Test}
\author{Eureka}
\date{\today}
\begin{document}

\section{sec}
\subsection{subsec}
\begin{frame}
  Hello world
\end{frame} 

\end{document}