Looking back on the extraordinary 5 years since the eighteenth CPC National Congress，General Secretary Xi Jinping has great foresight and grasps the trend. Basing on our country's Internet development，he puts forward a series of new concepts，new ideas，new strategies，and systematically expounds the important theoretical and practical problems related to network security and informatization，and formed a important thought of building China into a netwcrk power with rich connotation，extensive knowledge and scientific system.