Voilà la solution que j'ai obtenu obtenue de [tex.stackechange][1].
[tex.stackexchange][1].
Je l'a la mets ici, ici : cela pourra toujours aider quelqu'un d'autre.
\documentclass[british]{article}
\usepackage[T1]{fontenc}
\usepackage{babel}
\usepackage[utf8]{inputenc}
\usepackage{csquotes}
\usepackage[style=alphabetic,labelnumber,defernumbers,backend=biber]{biblatex}
\addbibresource{biblatex-examples.bib}
\renewbibmacro*{cite}{%
\printtext[bibhyperref]{%
\printfield{prefixnumber}%
\ifkeyword{primary}
{\printfield{labelnumber}}
{\printfield{labelalpha}%
\printfield{extraalpha}}}}
\defbibenvironment{numericbib}
{\list
{\printtext[labelnumberwidth]{%
\printfield{prefixnumber}%
\printfield{labelnumber}}}
{\setlength{\labelwidth}{\labelnumberwidth}%
\setlength{\leftmargin}{\labelwidth}%
\setlength{\labelsep}{\biblabelsep}%
\addtolength{\leftmargin}{\labelsep}%
\setlength{\itemsep}{\bibitemsep}%
\setlength{\parsep}{\bibparsep}}%
\renewcommand*{\makelabel}[1]{\hss##1}}
{\endlist}
{\item}
\DeclareFieldFormat{labelnumberwidth}{\mkbibbrackets{#1}}
\begin{document}
\cite{aristotle:physics,sigfridsson,worman,aristotle:poetics}
\printbibheading
\printbibliography[title={Numeric Bib},keyword=primary,env=numericbib]
\printbibliography[title={Alphabetic Bib},notkeyword=primary,omitnumbers]
\end{document}
[1]: http://tex.stackexchange.com/questions/301412/multiple-bibliographies-style-in-same-document-alpha-and-numeric
