First of all, sorry for my english grammar.
I am writing the thesis, could be submit to the external examiner soon.
I am using the original ruthesis.sty with some modification.
here i show the part of it.
%================================================================
\def\l@chapter#1#2
{\addpenalty{-\@highpenalty}
\addvspace{1.5em plus 1pt} % space above chapter line
\@tempdima 6em % width of box holding chapter number
\begingroup
\parindent \z@ \rightskip \@pnumwidth
\parfillskip -\@pnumwidth
\bf % Boldface.
\leavevmode % TeX command to enter horizontal mode.
\advance\@tempdima %% added 5 Feb 88 to conform to
-\leftskip %% 25 Jan 88 change to \numberline
#1\hfill\nobreak\hbox to \@pnumwidth{\hss #2}\par
\endgroup}
%=================================================================
I don't know how to explain my problem and i hope this picture can help.

thanks a lot
Regards.