also my charset is:
charset, UTF-8
charset.dic, UTF-8
charset.file, UTF-8
charset.extension, default

Hmm... I had tried to reproduce this problem, but I can't.
Perhaps this is also locale issue?

i'm sorry i've been at school for half a month, so i didn't reply to you
i tried RESTOREVAR again.
maybe because i put charset variable in the file that the non english variable name would not be load in the previous time
orz
BBBBBBBBut here's a new question
i've tried this
a=1
SAVEVAR('a.cfg')
a=2
LOADVAR('a.cfg')
when the code is complete, a is 2
should this be so?

I've tried same code on my ghost, but I can't reproduce bug.

my code:

a=1
SAVEVAR('a.cfg')
a=2
RESTOREVAR('a.cfg')

a=1 after RESTOREVAR executed.

Are you confusing RESTOREVAR and LOADVAR?

In my ghost, LOADVAR is the abbreviation of RESTOREVAR, sorry to bother you
I'll update yaya.dll when I back home Then try that code again. It'll take about a week
PS: is there any way to run ghost on smart phone? I can only use my phone secretly in school, but there seems to be no wine package for termux.

I think you can use this, if you are using Android smartphone.
https://play.google.com/store/apps/details?id=com.dendenfactory.ukagakaforandroid&hl=ja

Thank you for introducing this app
But my ghost can't run on this
I turned on the iolog function of yaya, but there was no log output
The screen record is here:https://raw.githubusercontent.com/steve02081504/pan/master/ES%E6%96%87%E4%BB%B6%E6%B5%8F%E8%A7%88%E5%99%A8.mp4

error code here:
OnTest{
_save_dir=GETENV('USERPROFILE')
a=1
SAVEVAR(_save_dir+'\a.cfg')
a=2
LOADVAR(_save_dir+'\a.cfg')
a
}
the OnTest returns 2
GETENV's def:
RUNCMD{
EXECUTE_WAIT('cmd','/D /C chcp 65001 '+'&& cd .\ghost\Taromati2\ghost\master '+'&& '+_argv[0])
}
GETENV{
_temp=MKDIR('var')
_temp=RUNCMD('echo %'+_argv[0]+'% > var\ENV.tmp')
_temp=FOPEN('var\ENV.tmp','r')
_t=FREAD('var\ENV.tmp')
_temp=FCLOSE('var\ENV.tmp')
_t=RE_REPLACE(_t,'\s+$','')
_t
}

I have tested your script and found error at EXECUTE_WAIT.
Current directory may change for unexpected reasons, so you can't execute cmd.exe in a stable condition.

Please use latest YAYA. You can get environment variable directly using new system function GETENV.

OnTest still return 2 when useing yaya's GETENV.
XD.