This report explores how mainstream media could realize trans-platform convergence in subject reports by analyzing the case of Xinhua News Agency’s news game product China’s Change on QQ Speed. Mainstream media nowadays faces new challenges such as the youth-dominated audience population and the mediated communication environment. By integrating news with gaming，Xinhua News Agency embodies national identity and news elements in game design，so as to realize the trans-platform communication of patriotism education. This practice attracts the target audience to immerse and to experience，and is regarded as a beneficial attempt to improve the communication effect in the era of mobile Internet. In the future，the practice of trans-platform convergence should proceed from the perspective of the audience and integrate mainstream media with commercial platforms.