The objective of this paper is to reveal the reality of the use of the New Technologies ICT on the competitive analysis, in the context of the Tunisian Firms, through the study of one of the most important on a national scale which is the Tunisian public CPGT Firm. This research study, besides, allowed revealing the role and the real impact of the ICT on the competitive structure of this Firm within this more relentless world environment. We took as approach of empirical investigation the technique of the survey (investigation) by questionnaire with the staff and the conversations (interviews) with the responsible leaders on the strategic orientation of the firm in the medium and long term, on the technological and informative infrastructure as well as at the level of the competitive strategy of the firm.