已经解决。

\documentclass[a6paper]{article}

\usepackage{axodraw4j}
\usepackage{pstricks}
\usepackage{color}

\setlength{\oddsidemargin}{0pt}
\setlength{\evensidemargin}{0pt}
\setlength{\topmargin}{0pt}
\setlength{\headheight}{0pt}
\setlength{\headsep}{0pt}
\setlength{\topskip}{0pt}
\setlength{\footskip}{0pt}
\setlength{\textwidth}{\paperwidth}
\addtolength{\textwidth}{-2in}
\setlength{\textheight}{\paperheight}
\addtolength{\textheight}{-2in}

\pagestyle{empty}



\begin{document}

%%JaxoComment:
%%JaxoScale{1.0}


\begin{center}
\fcolorbox{white}{white}{
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    \SetWidth{1.0}
    \SetColor{Black}
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    % Singular FArc, ignored!

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\end{document}

\documentclass[twoside]{article} 
\usepackage[heading=true]{ctex}
\usepackage[a4paper,inner=35.7mm,outer =27.7mm,top=27.5mm,bottom=2.45mm,showframe]{geometry}

\usepackage{fancyhdr}%设置页眉页脚
\fancypagestyle{myhf}{
    \fancyhead{}
    \fancyhead[CO]{afas}
    \fancyhead[CE]{6666}
}
\pagestyle{myhf}

\ctexset{section={
        number=\arabic{section},
        name={第,章}}
}
\begin{document}
    \centerline{{\songti \zihao {2} 摘要} }\vspace{1em}
    在宇宙大爆炸早期阶段,宇宙是由夸克和胶子等基本粒子构成的退禁闭相 
    \newpage
    \tableofcontents
    \newpage
    \section{背景知识简介}
    \subsection{基本粒子}
    在大自然中,存在着四种最基本的相互作用,它们分别是引力相互作用、
    \addcontentsline{toc}{section}{参考文献}
\end{document}

因为我用了 twoside ,所以奇偶页错开了，那么如果我不想让奇偶错开，既页面都保持在一条直线上，（就像用了oneside 一样。），同时奇偶页页眉依然保持不同。
总结 就是 用 twoside 达到了 奇偶页页眉不同， 但是 奇偶页错开了，

              用  oneside  ,达到了 奇偶页没错开，但是  只显示奇数页的页眉。
            如何实现，奇偶页的页眉不同，同时   奇偶页没有错开