There is no doubt the media today, behaviors, beliefs shape public opinion, given that the era of media competition, and each of the following preferred media and legitimize their discourse based on the values of modernism includes in democracy. The main objective of the study is to investigate the relationship between media use with the trend of the values of democracy. That democratic values are considered in four dimensions (political participation, freedom of expression, political parties and participate in activities free demonstrations). This research is conducted as a survey using a questionnaires. The sample includes 384 citizens aged 20 years in four municipal districts of Tehran. The results of the questionnaire, data analyzed via ANOVA (one-way, are analyzed using SPSS software. The results show that the trend of democratic values in networks BBC and VOA and Network 20:30 news, the news network a statistically significant difference at 99% confidence there (F=24.701). Kayhan, information, Iran, Citizen and confidence in the trend of the values of democracy, a significant difference at 99% confidence level and the amount is F = 23.609.