Dear everyone,
In the last but one email, there are some mistakes in my expression.
>>I have generated q-points via PW/kpoint_grid.f90 and I'm testing it
>>using 3.2 version.
I just used 3.2 version, it generates qpoints automatically
through ph.x, not via PW/kpoint_grid.f90.
I'm sorry for misleading you.
Good luck!
Guoying