I understood my questions from this mail:
http://sourceforge.net/mailarchive/message.php?msg_id=c15a31020910212159r128ea1a5x1c889d077f590f8%40mail.gmail.com
From this mail, It seems the output flux doesn’t divide the cross area and the accumulated time and its unit is energy unit, which is different from the definition in the literature.
Anyway, thank all of you!
Dongshan