Research on media law in this article is a social science to study various social relationships and legal relationships in mass communication activities, and a social science to study how media law be enacted and be practiced. Since some person suggested to enact Media Law in mid-80's in China mainland, several scholars have begun to study media law. Though a special Media Law has not been appeared yet, media communication activities in China mainland are found to be relevant to many contents of current law with development of legal system construction. Research on media law has made some progress also. The course of research on media law in China mainland is divided into 3 stages in this article: (1) In the first stage, scholars have done sufficient demonstration on leading theory and basic principle of media legislation in order to go with drafting Media Law. Many theories are concerning about press freedom. And scholars have also done extensive research about media law in this stage. (2) In the second stage, scholars have paid more attention to media tort. They have done much research on balance between media rights and citizen personality rights, which have greatly enriched law on media tort. (3) In the third stage, research on media law is much more deep and synthetic than ever before. Some books to study framework of media legal system have appeared. It means that media law system in China mainland have had much systematically content. However, books published on media law in China mainland now are mainly to guide to use. Theoretical research must be improved in the future.