Abstract : The main purpose of this work was to extend the researches on pre-trial publicity initially studied in the United States by integrating the contributions of social psychology of communication. This work concentrated on two principal aspects, taking count of a circulary conception of communication and taking count of syntactical aspects of style, beyond the content of the message. Our hypothesis, based on the theory of reading contract (Burguet, 1999), are specified in order to study the effets of pre-trial press articles. Firstly, a discursiv analysis was conducted and a typical writing of pre-trial press articles was defined. Secondly, a questionary was created in order to evaluate press articles credibility in the following experimental researches. Two series of experimental researches were conducted. ln the first serie (studies 3, 4,5 and 6), the syntactics caracteristics of press articles were manipulated (articles were conform versus unconform to these caracteristics). The results show that readers are sensible to these modification. They better identifie typical articles, and evaluate them more credible. ln the second serie, (studies 7 , 8 and 9), narrativ and argumentativ aspects of writing style were manipulated. These studies show that narrativ and argumentativ aspects influence pre-trial judgments. More generally, this work provides informations on the importance of taking count of discusiv style of media and its effets on judgments, beyond the content of the message.