China has entered the era of mobile Internet，and is moving its step from a big country of network to a powerful country of network. The coming of 5G era will effectively promote the rapid development and great change of China’s economy and society. Based on the development of the situation，how to promote the deep integration of the media unswervingly，make the mainstream public opinion bigger and stronger，and with the help of mobile communication to let the mainstream media firmly occupy the communication commanding heights of public opinion guidance，ideological guidance，cultural heritage and serving the people，is the current research hotspot in the industry. As a local news website，Jiangxi News Network of China，a subsidiary of Jiangxi Daily，combined with its own situation，closely centering on the three elements of government，audience and media，constructs a new ecology of mainstream public opinion，pushes the integration of mainstream media to a deeper level，constantly strengthens the mainstream media，and plays a leading role of mainstream public opinion.