الخلاصة:
The publicity is an integral part of the life o
f Algerians; it is visible in all the 
supports.  In the  media,  Algerian  publicity  seems  to
 us  an  extremely  interesting 
field of research today. 
    Our  research  is  grounded  under  the  vast  field  o
f  the  sociolinguistics.  It  is 
interested  in  the  analysis  of  code  switching  but  al
so  in  the  phenomena  of  the 
loan and the neology. 
    In  this  study  we  tried  (starting  from  a  corpus 
made  up  of  posters  of 
newspapers) to identify the various forms of code s
witching, and to include the 
reasons of their uses by the advertising executives
. 
    Our  research  also  proposes  to  undertake  a  compa
rative  study  between  the 
three companies of mobile telephony, in order to re
lease the factors of the code 
switching of these companies