```tex
% !TEX program= xelatex
\documentclass[*a4paper*]{ctexart}
\usepackage{amsmath}
\usepackag...
```tex
% !TEX program= xelatex
\documentclass[*a4paper*]{ctexart}
\usepackage{amsmath}
\usepackage{amssymb}
\begin{document}
$2 \sum\limits_{1\leqslant i\leqslant j\leqslant n}^{}a_ia_jCov(X_i,X_j)$
\end{document}
```
求教大佬们有没有把求和符号前后间距（红色部分）缩小的方法呢
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用\!试试，不过我觉得没必要调整，默认的，应该是最合理的。
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