How to increase Chinese character space?

Question

Sometimes the spaces between Characters are too small, especially in book titles which could be seen in the following picture.

Then my QUESTION is how to increase the space between Chinese characters?

I used \CJKglue to improve this but failed. Who has some more advice？

A working sample is as follows:

\documentclass[UTF8]{ctexart}
\begin{document}
大闹天宫始末

\end{document}

Answer 1

\ziju{<factor>} works.

\documentclass[UTF8]{ctexart}
\CTEXnoindent
\begin{document}
    大闹天宫始末

    \ziju{0.3}
    大闹天宫始末
\end{document}