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How we give a vertical gap of 25 mm between the Chapter number (#) and chapter title lines and between chapter title line and the first paragraph.

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Building on Space length between the chapter number and the chapter title, the spaces you're after are given in \@makechapterhead for \chapter (and \@makeschapterhead for \chapter*). The following definition(s) are taken from report.cls:

\def\@makechapterhead#1{%
  \vspace*{50\p@}%
  {\parindent \z@ \raggedright \normalfont
    \ifnum \c@secnumdepth >\m@ne
        \huge\bfseries \@chapapp\space \thechapter
        \par\nobreak
        \vskip 20\p@% <--- Chapter title & Chapter text
    \fi
    \interlinepenalty\@M
    \Huge \bfseries #1\par\nobreak
    \vskip 40\p@% <------- Chapter text and first paragraph
  }}

\def\@makeschapterhead#1{%
  \vspace*{50\p@}%
  {\parindent \z@ \raggedright
    \normalfont
    \interlinepenalty\@M
    \Huge \bfseries  #1\par\nobreak
    \vskip 40\p@% <------- Chapter text and first paragraph
  }}

These values can be patched/altered using etoolbox:

enter image description here

\documentclass{report}
\usepackage{etoolbox}% http://ctan.org/pkg/etoolbox
\makeatletter
% \patchcmd{<cmd>}{<search>}{<replace>}{<success>}{<failure>}
\patchcmd{\@makechapterhead}{20\p@}{25mm}{}{}% Correct \chapter
\patchcmd{\@makechapterhead}{40\p@}{25mm}{}{}% ... \chapter
\patchcmd{\@makeschapterhead}{40\p@}{25mm}{}{}% ... \chapter*
\makeatother
\begin{document}
\chapter{A chapter} Some text
\chapter*{Another chapter} Some text
\end{document}
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  • It doesn't effect. Why you are giving it two or three times. It is same for \chapter{} and \chapter*{}.
    – Deepesh Patel
    Nov 29, 2013 at 18:05
  • 1
    @DeepeshPatel: Each patch changes a single thing. The first does a search-and-replace of 20\p@ to 25mm in \@makechapterhead. The second does a search-and-replace of 40\p@ to 25mm in \@makechapterhead. The third does a search-and-replace of 40\p@ to 25mm in \@makeschapterhead. Two different macros, three different search-and-replaces. Are you perhaps loading some sectioning package like titlesec? Sectioning packages usually redefine these macros I'm trying to update, causing the search-and-replace to not work.
    – Werner ♦
    Nov 29, 2013 at 18:10

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