As Audrey so succinctly notes in the comments, (and as Mico and I commented on your question) you simply can't use .bst files with biblatex. So the best solution would be to find existing biblatex style that comes close to the elsarticle-harv style.
Since the elsarticle-harv is a generic author-year style, the first place to start might be one of the standard author-year styles that biblatex provides. If they are not sufficient, perhaps you could try the apa style for biblatex. This produces fairly standard Author-Year citations and bibliography. Here's a simple example with references per chapter added to the table of contents.
\documentclass{book}
% The next 4 lines are required for the biblatex-apa style
% adding the refsection=chapter option makes allows each chapter to have a
% references section
\usepackage[american]{babel}
\usepackage{csquotes}
\usepackage[style=apa,backend=biber,refsection=chapter]{biblatex}
\DeclareLanguageMapping{american}{american-apa}
% load your bib file (.bib suffix required)
\addbibresource{newmainjournals.bib}
\begin{document}
\frontmatter
\tableofcontents
\mainmatter
\chapter{First Chapter}
% insert some citation commands in your text
% at the end of the chapter, print the bibliography as a section, added to TOC
\printbibliography[heading=subbibintoc]
% now repeat for the next chapter
\chapter{Second Chapter}
% some more citation commands
% and the next references section
\printbibliography[heading=subbibintoc]
\backmatter
\end{document}
.bstfile :( – KOF Feb 06 '13 at 01:19elsarticle-harvif I usebiblatexinstead ofBibTeX"? – Mico Feb 06 '13 at 01:20natbib/elsarticle-harv/BibTeXto an alternative solution based on bibLaTeX? – Mico Feb 06 '13 at 01:22biblatex, so maybe i could make use of the advantage of it. – KOF Feb 06 '13 at 01:31.bstfile is a style specified in the\usepackage[style=<a-biblatex-style>]{biblatex}command. There is no one-to-one correspondence between existingnatbibstyles andbiblatexstyles, but there are a lot of harvard like styles forbiblatex. A lot depends on how exactly you need to use theelsarticle-harvstyle. – Alan Munn Feb 06 '13 at 01:41style=elsarticle-harvoption does not work. Could you please give the link of those style files forbiblatex? – KOF Feb 06 '13 at 01:49biblatex-contribfolder of CTAN. All of these styles should be part of TeXLive and MikTeX, so you shouldn't need to download them separately if your distribution is complete and up-to-date. If you don't have them, you should use regular methods for adding packages to your distribution (tlmgrfor TeXLive or its MikTeX equivalent.) – Alan Munn Feb 06 '13 at 02:00elsarticle-harv, the only clear "Harvard-like" attribute is its implementation of an author-year citation system -- something first achieved on a stable basis, if memory serves me correctly, by theharvardpackage, quite some time before thenatbibpackage came around. For journals published by Elsevier, the recommendation is always to use thenatbibpackage. The "harv" inelsarticle-harvmay thus be a bit misleading. – Mico Feb 06 '13 at 02:01