Hi I have problem in how to define Theme of my font when submited. Is it OK if I use wrong theme of my font?

Chose the closest theme.
If it doesn't really fit, don't worry, someone at dafont will change it.

So it mean that no true if Submitted Font will be rejected because of wrong theme?

yes, Dafont will fix the theme, not reject the font

By the way, is it possible to put one font on multi theme?if yes how

one theme only, as seen on this page https://www.dafont.com/submit.php