I need to setup page number right side of the footer. It's ok in the second page of a chapter.

But in chapter title page, page number showing in the center of that page.

This is my MWE:

documentclass[a4paper,12pt]{report}

usepackage[left=1.5in,right=1in,top=1in,bottom=1in,includefoot,heightrounded]{geometry}

usepackage{lipsum} 

usepackage{fancyhdr}

renewcommand{baselinestretch}{1.3}

usepackage{titlesec}



titleformat{chapter}[display]{normalfonthugebfseriescentering}{chaptertitlename thechapter}{20pt}{Huge}

titlespacing{chapter}{0pt}{0pt}{1cm}



begin{document}

begin{center}

{huge textbf{ Abstract}}

end{center}

addcontentsline{toc}{section}{Abstract}

lipsum[2-4]

pagenumbering{roman}

pagestyle{fancy}

fancyfoot{}

fancyfoot[R]{thepage}



fancyhead[L]{textit{chapternamethechapter}}



chapter{Introduction}



pagenumbering{arabic}

setcounter{page}{1}

lipsum[2-4]

lipsum[2-4]

end{document}

Please tell me the solution.

You need to redefine the page style plain used on the chapter title page like:

fancypagestyle{plain}{% <==============================================

  fancyhf{}

  fancyfoot[R]{thepage}

  renewcommand{headrulewidth}{0pt}

  renewcommand{footrulewidth}{0pt}%

}

With the complete code

documentclass[a4paper,12pt]{report}



usepackage[%

  left=1.5in,right=1in,top=1in,bottom=1in,

  includefoot,heightrounded

]{geometry}

usepackage{lipsum} 

usepackage{fancyhdr}

renewcommand{baselinestretch}{1.3}

usepackage{titlesec}



titleformat{chapter}[display]{normalfonthugebfseriescentering}{chaptertitlename thechapter}{20pt}{Huge}

titlespacing{chapter}{0pt}{0pt}{1cm}



fancypagestyle{plain}{% <==============================================

  fancyhf{}

  fancyfoot[R]{thepage}

  renewcommand{headrulewidth}{0pt}

  renewcommand{footrulewidth}{0pt}%

}



begin{document}

pagenumbering{roman}

pagestyle{fancy}

fancyfoot{}

fancyfoot[R]{thepage}



fancyhead[L]{textit{chapternamethechapter}}



chapter{Introduction}



pagenumbering{arabic}

setcounter{page}{1}

lipsum[2-4]

lipsum[2-4]

end{document}

you get:

Update:

To add an chapter/abstract before chapter 1 please change your used code to:

%begin{center} % <======================================================

chapter*{Abstract}

%end{center}

%addcontentsline{toc}{section}{Abstract}

lipsum[2-4] % <========================================================

With the complete code

documentclass[a4paper,12pt]{report}



usepackage[%

  left=1.5in,right=1in,top=1in,bottom=1in,

  includefoot,heightrounded

]{geometry}

usepackage{lipsum} 

usepackage{fancyhdr}

renewcommand{baselinestretch}{1.3}

usepackage{titlesec}



titleformat{chapter}[display]{normalfonthugebfseriescentering}{chaptertitlename thechapter}{20pt}{Huge}

titlespacing{chapter}{0pt}{0pt}{1cm}



fancypagestyle{plain}{% <==============================================

  fancyhf{}

  fancyfoot[R]{thepage}

  renewcommand{headrulewidth}{0pt}

  renewcommand{footrulewidth}{0pt}%

}





begin{document}

pagenumbering{roman}

pagestyle{fancy}

fancyfoot{}

fancyfoot[R]{thepage}



fancyhead[L]{textit{chapternamethechapter}}



%begin{center} % <======================================================

chapter*{Abstract}

%end{center}

%addcontentsline{toc}{section}{Abstract}

lipsum[2-4] % <========================================================



chapter{Introduction}



pagenumbering{arabic}

setcounter{page}{1}

lipsum[2-4]

lipsum[2-4]

end{document}

you get then:

Since you load titlesec, it's much simpler to load it with option pagestyles and use titleps. You have to redefine the plain page style, which is used in the first page of a chapter. Redefining a page style is particularly easy with titleps:

documentclass[a4paper,12pt]{report}

usepackage[left=1.5in,right=1in,top=1in,bottom=1in,includefoot,heightrounded]{geometry}

usepackage{lipsum}



renewcommand{baselinestretch}{1.3}

usepackage[pagestyles]{titlesec}

newpagestyle{mine}{%

headrule

sethead{itshapechapternamethechapter}{}{itshapechaptertitle}

setfoot{}{}{thepage}}%



renewpagestyle{plain}{%

setfoot{}{}{thepage}}%



titleformat{chapter}[display]{normalfonthugebfseriescentering}{chaptertitlename thechapter}{20pt}{Huge}

titlespacing{chapter}{0pt}{0pt}{1cm}

pagenumbering{roman}

pagestyle{mine}

begin{document}



chapter{Introduction}



pagenumbering{arabic}

setcounter{page}{1}

lipsum[2-10]



end{document}