In this study, researcher examined the rate of correct news writing principles between four numerous Tehran morning newspapers.The main objective of this study is the rate of correct use of principles in news writing between national newspapers, which for this purpose, seven hypotheses are discussed.96 No of 4 the daily news papers as the, "Iran", "Hamshahri", "Mardom Salari" and "Arman Ravabet Omomi" at the year of 1389 are forming our statistical Sampling in this study.our sampling in this research is The first 12 months of the year were divided into four seasons And the division of this seasons is the first season, first month, fourth week, the second season, the second month, second week, the third season, the third month, and the third week of the fourth season, the first month.Content analysis method to study and perform with the way the questionnaire is reversed.According to the results of all their hypotheses were confirmed. Thus, The type and nature of the news, the newsoriented content, argent Content, news values, here is a significant relationship between Subject choice and headlines.We can therefore conclude that, despite Attempts in the past two decades, efforts to train journalists in the country seem to affect the quality of newsppers and professional principles not correct or is low.