\pagestyle{fancyplain}
\fancyhead{}
\fancyhead[C]{\mysignature}
\fancyfoot[C]{第 \thepage 页\quad 共 \ref{TotPages} 页}
% \definecolor{shadecolor}{named}{white}
\makeatletter
\ctexset{
    chapter/break = \addpenalty{\@secpenalty}
}
\makeatother