Hi Zhang,
Acctually, it's not what i'm looking for. In your case, you predefine a space for STKRAM (from x300 to x48F), however when I use processor expert to generate a similar configuration, it doesn't define any size for STACK. It just let the stack to be placed in all remanescent space of RAM segment.
In the project that i've attached, I don't use processor expert (because of very density code, almost fill uC ROM), but testing it like I said works fine.
I just doesn't understend what is the difference.
If you can test it, try to set processor build options like that:

Thank you.