In recent years, the rapid development of selfmedia based on social interaction continuously makes all social fields including politics, economy, culture and so on be integrated into social interaction media era so that internet users become the main body of online media. Internet has become the distributing center of voices and wills of society and masses, when a public event happens, the internet users can express their opinions and vent their sentiment by selfmedia, so that some online hot concerned events form. This paper aims to explore the basis for the formation of online hot events, and reveals the factors and laws for the production and transmission of the hot events from the perspective of self media.