From a global perspective, the mobile Internet is developing rapidly, big data applications are irresistible, and the protection of personal information and privacy has become a global and industrial challenge. China is one of the most active Internet activities in the world. Massive personal information is constantly flowing on the optical fiber network and the invisible 4G network. Creating a legal environment that protects personal information and a law enforcement environment is the foundation of industrial prosperity and user safety. From this perspective, breakthroughs Enforcement bottlenecks and ensuring the security of personal information in the era of big data have important implications for individuals, society and the country. This text mainly emphasizes:. ['Background for ensuring the security of personal information in the era of big data.', 'Significance of ensuring personal information security in the era of big data.', 'Challenges to Personal Information Security in the Big Data Era.', 'Measures to ensure the security of personal information in the era of big data.']