This study looks to analyze eventual intonation curves of French special questions with “est-ce que”. Current descriptions of French intonation system cannot be considered complete. This necessitates additional experimental studies using instrumental research methods. The present research was done on the basis of the large volume of sound material. We studied situational dialogues with a total length of sound of 23,5 hours. As a result of the carried-out experimental analysis were obtained about types of intonation in the end of special questions with “est-ce que”. Special attention should be paid to intonation curves that were not previously described in theoretical sources.