在latex中，想给表格添加注释，可以使用threeparttable这个包
代码如下：
\usepackage{threeparttable}
\begin{table*}
\begin{threeparttable}
\centering \caption{Statistical results of the IGD values of the final populations obtained by RM-MEDA and RM-MEDA-II on the 10 test instances over 30 runs.}
\label{TAB1}
\begin{tabular}{l|cccc|cccc}\hline\hline
instance&\multicolumn{4}{c}{RM-MEDA}&\multicolumn{4}{|c}{RM-MEDA-II}\\
&mean&std.&best&worst&mean&std.&best&worst\\\hline
$F_{1}$ &$3.90e-03$ &$1.39e-04$ &$3.70e-03$ &$4.20e-03$ &$\textbf{3.60e-03}$ &$1.02e-04$ &$3.40e-03$ &$3.80e-03$\\\\
$F_{2}$ &$3.80e-03$ &$1.43e-04$ &$3.50e-03$ &$4.10e-03$ &$\textbf{3.70e-03}$ &$9.83e-05$ &$3.50e-03$ &$3.90e-03$\\\\
$F_{3}$ &$7.20e-03$ &$3.90e-03$ &$3.60e-03$ &$1.55e-02$ &$\textbf{6.70e-03}$ &$1.10e-03$ &$3.80e-03$ &$8.50e-03$\\\\
$F_{4}$ &$5.03e-02$ &$1.30e-03$ &$4.82e-02$ &$5.35e-02$ &$\textbf{5.08e-02}$ &$2.10e-03$ &$4.81e-02$ &$5.62e-02$\\\\
$F_{5}$ &$5.30e-03$ &$3.00e-03$ &$4.40e-03$ &$2.12e-02$ &$\textbf{4.50e-03}$ &$1.53e-04$ &$4.20e-03$ &$4.80e-03$\\\\
$F_{6}$ &$8.30e-03$ &$2.10e-03$ &$5.70e-03$ &$1.50e-02$ &$1.62e-02$ &$2.30e-02$ &$5.40e-03$ &$1.20e-01$\\\\
$F_{7}$ &$1.60e-01$ &$2.35e-01$ &$7.96e-02$ &$1.03e+0$ &$1.76e-01$ &$2.33e-01$ &$3.28e-02$ &$1.02e+0$\\\\
$F_{8}$ &$6.59e-02$ &$3.50e-03$ &$6.05e-02$ &$7.69e-02$ &$\textbf{6.37e-02}$ &$3.60e-03$ &$5.81e-02$ &$7.65e-02$\\\\
$F_{9}$ &$8.00e-03$ &$2.80e-03$ &$5.80e-03$ &$1.48e-02$ &$\textbf{7.70e-03}$ &$3.20e-03$ &$5.40e-03$ &$2.24e-02$\\\\
$F_{10}$ &$1.25e+02$ &$2.35e+01$ &$2.27e+01$ &$1.44e+02$ &$\textbf{2.36e+02}$ &$3.48e+01$ &$5.02e+0$ &$1.38e+02$\\
\hline\hline
\end{tabular}
\begin{tablenotes}
\item[1] The bolder ones mean better.
\end{tablenotes}
\end{threeparttable}
\end{table*}