Hi @ShaohangYuan,

I don't believe this is something that's currently possible in Canvas.  It's an interesting idea, but as a Canvas admin myself, I think our institution's security team would shoot this down fairly quickly even f Canvas could do it.  Our sessions seem to last at least a day, are yours shorter than that and causing issues for students?  I *think* your Instructure CSM may be able to adjust the overall timeout for your instance, so that could be something you could check on.

-Chris