Quote Originally Posted by Perspective
edit your ".emacs" file (probably in your home directory) using the Lisp like emacs scripting language.

- OR -

click: Options -> Customize Emacs -> Top level Customization Group
and customize through the GUI.
thanx i dive myself into Top level Customization and found standard indent size is 4 ? but actually when i coding a file default it seems indent is 8 spaces far. what's wrong ???