The trend is from pan - politicization to main streani of economical life , which has consequently influenced what to report in journalism and communication practice and what to research in mass media theories . secondly , the party papers in different levels used to be the body of challenge in the inner environment of media 从理论到实践，从宏观到微观，媒介环境一系列变化的最深层次的原因正来源于此；二，就内部环境而言，在改革开放前，甚至是改革开放后的相当长的时期内，我国的新闻媒体一直是纯事业型的国营单位。
