The CPC Central Committee with Xi Jinping as the core attaches great importance to the ideological work, and has put forward a series of new ideas and new conclusions and new requirements on how to maintain the safety of Chinese ideology under the new situation. With the arrival of the era of big data, the dissemination and integration efficiency of massive information is gradually improved, which makes Chinas ideological security face unprecedented opportunities and challenges. To maintain and protect Chinas ideological security, we can take the following measures, including the promoting Marxs position, strengthening the construction of the information security ability in the big data era, strengthening the construction of moral system, leading the public opinion and adopting countermeasures in the big data era.