Abstract: With the iterative combination and evolution of communication media, the communication pattern has undergone profound changes, and people's living order and way of thinking have also changed in the in-depth communication with the media. Fuison media communication exerts a profound influence beyond the dimension of time and space with its outstanding constructive and integrated power on the practice of youth ideological identity. General Secretary Xi Jinping's important expositions on network ideology work in the new era should be used as a practical guidance to enhance the mainstream ideological identity of young people, and to plan the practice of identity enhancement in the era of fusion media. Taking value production that enriches the “supply side” of mainstream ideology as a practical guarantee for identity promotion, it provides strong support for identity promotion practice. Taking the “extended body” of mainstream ideology in the media field as the practical direction of identity promotion, it describes the realistic approach for identity promotion practice.