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The rapid development of big data push the big changes to every industries and government agencies.The concept of big data and security intelligent system framework was cleared.Then,the serious problems of the devel-opment of intelligent public security were analyzed,the novel work model of public security was also studied,and the new paths and method were pointed ont.Next,the intelligent information system for public security was built up,and the effectiveness of this system were evaluated.The system can efficiently meet the requirements of the current public security,and serve the national security with great significance.