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I use package longtable to make a table as follows. Please help to center the content in the first head and the head of the table. Thanks!

\begin{center}
\renewcommand\tablename{Appendix}
\begin{longtable}{| p{0.3 \textwidth} | p{0.6 \textwidth} |}
\caption{\bf Outline of PS(V) 1.8c-12} \label{appendix2} \\
\hline  \ PS(V) 1.8c-12 & Outline} \\ \hline \hline
\endfirsthead
\multicolumn{2}{c}%
{{\bfseries \tablename\ \thetable{}: Outline of PS(V) 1.8c-12}} \\
\hline {PS{V} 1.8c-12} & {Outline} \\ \hline \hline
\endhead
\hline \multicolumn{2}{|r|}{{\tiny Continued on next page}} \\ \hline
\endfoot
\hline \hline
\endlastfoot
123 & abc \\
\hline
123 & abc \\
\hline
123 & abc \\
\hline
123 & abc \\
\hline
123 & abc \\
\hline
123 & abc \\
\hline
123 & abc \\
\hline
123 & abc \\
\hline
123 & abc \\
\hline
123 & abc \\
\hline
123 & abc \\
\hline
123 & abc \\
\hline
123 & abc \\
\hline
123 & abc \\
\hline
123 & abc \\
\hline
123 & abc \\
\hline
123 & abc \\
\hline
123 & abc \\
\hline
123 & abc \\
\hline
123 & abc \\
\hline
123 & abc \\
\hline
123 & abc \\
\hline
123 & abc \\
\hline
123 & abc \\
\hline
123 & abc \\
\hline
123 & abc \\
\hline
2

Some comments and suggestions:

  • Don't embed a longtable environment inside a center environment -- the longtable is automatically centered horizontally.

  • By "center the content in the first head", I assume you wish to achieve horizontal centering. If that's correct, simply add \multicolumn{1}{|c|}{...} wrappers for the first column headers and \multicolumn{1}{c|}{...} for the second.

An MWE:

\documentclass{article}
\usepackage{longtable}
\begin{document}

\renewcommand\tablename{Appendix}
\begin{longtable}{| p{0.3\textwidth} | p{0.6\textwidth} |}
\caption{\bf Outline of PS(V) 1.8c-12} \label{appendix2} \\
\hline 
\multicolumn{1}{|c|}{PS(V) 1.8c-12} & \multicolumn{1}{c|}{Outline} \\ 
\hline \hline
\endfirsthead

\multicolumn{2}{c}{\bfseries\tablename\ \thetable: Outline of PS(V) 1.8c-12} \\
\hline 
\multicolumn{1}{|c|}{PS(V) 1.8c-12} & \multicolumn{1}{c|}{Outline} \\ 
\hline \hline
\endhead

\hline 
\multicolumn{2}{r@{}}{\tiny Continued on next page} \\ 
\endfoot

\hline \hline
\endlastfoot

123 & abc \\
\hline
123 & abc \\
\hline
123 & abc \\
\end{longtable}
\end{document}
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