With the development of communication networks, especially the Internet, high-tech crime has become a new challenge for law enforcement agencies. With the help of the cyber security system, law enforcement agencies can discover and track the suspects’ clues and intelligence on the communication network. Through advanced big data analysis technology, the system can help law enforcement agencies to improve the efficiency and accuracy of investigations and forensics. Big data analysis of open source network information such as social networks can accurately find hot topics, track topic trends, analyze topic areas and population distribution, etc., and help crime prevention.