Abstract: According to the problem that the current intrusion tolerance system requires too much manual intervention and lack of self-adaptability, this paper proposes a model of intrusion tolerance system based on autonomic computing.The model drawing on autonomic computing ideas and feedback mechanism can analyze the reliability of the network connection in real time and generate initial reliability, and though the reliability threshold′s independent study and adjustment, implement the dynamic reliability optimization, and ultimately tolerate the suspicious connections, achieve the goal of protecting the target system security.