网上找的 希望有用
第一种方法：这是从IEEE摘选出来的输入方式，但是这个方式会使得公式移动到下一页浮动置顶。
\newcounter{mytempeqncnt}
\begin{figure*}[!t]
% ensure that we have normalsize text
\normalsize
% Store the current equation number.
\setcounter{mytempeqncnt}{\value{equation}}
% Set the equation number to one less than the one
% desired for the first equation here.
% The value here will have to changed if equations
% are added or removed prior to the place these
% equations are referenced in the main text.
\setcounter{equation}{5}
\begin{equation}
\label{eqn_dbl_x}
x = 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21+ 23 + 25
+ 27 + 29 + 31
\end{equation}
\begin{equation}
\label{eqn_dbl_y}
y = 4 + 6 + 8 + 10 + 12 + 14 + 16 + 18 + 20+ 22 + 24
+ 26 + 28 + 30
\end{equation}
% Restore the current equation number.
\setcounter{equation}{\value{mytempeqncnt}}
% IEEE uses as a separator
\hrulefill
% The spacer can be tweaked to stop underfull vboxes.
\vspace*{4pt}
\end{figure*}
第二种方法：使用multicol来实现，这个方法较为贴近我们平时的习惯。
\begin{multicols}{2}
Bla bla...
\end{multicols}
%
\begin{equation}
very long equation
\end{equation}
%
\begin{multicols}{2}
Bla bla...
\end{multicols}，
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