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This paper presents an intrusion-tolerant distributed database system security model of power enterprise. While traditional secure distributed database systems depend on preventive measures and are limited in surviving malicious attacks, this model can detect intrusions, isolate attacks, assess and repair the damage caused by intrusions in a timely manner. In this way, the system can maintain the integrity and availability of data. As for confidential data, a (t, n) threshold secret share scheme is utilized to protect them from compromised servers in the presence of intrusions. In this way, the system can realize the confidentiality of data.