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I can change the main font in the preamble using 

\usepackage{fontspec}
\setmainfont{Arial}

but it only works for the legend but not axis tick label, I've installed Arial font. I don't want to use 

\usepackage{helvet}
\usepackage{sansmath}

for they are not the same as Arial. Thank you for your help!

Hu jinrong
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    This question might be helpful: https://tex.stackexchange.com/q/33325 – nidhin Aug 11 '19 at 03:21
  • If you can load unicode-math, it should be able to set your \mathrm font to Arial. (Should happen automatically if you set the main font, or use \setmathrm.) You can also \setsansfont and use \mathsfup. – Davislor Aug 11 '19 at 04:03
  • @nidhin, I tried that, but the {helvet} package derived font was not the totally same as Arial – Hu jinrong Aug 11 '19 at 06:31
  • @Davislor, thank you, but unicode-math don't work. – Hu jinrong Aug 11 '19 at 09:40

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