\documentclass{beamer}
\usetheme{Madrid}
\usecolortheme{default}
\usepackage{ctex}
\usefonttheme[math]{serif}\usepackage{graphicx}
\graphicspath{{img/},{pics/}}	% 图片在img目录\title{}
\author{}
\institute{}
\date{\today}
\begin{document}\maketitle\begin{frame}\frametitle{}	\end{frame}\end{document}