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Danger theory is a new research direction of artificial immune system. Its main idea is to detect anomalies by the discovery and fusion of danger signals. The adaptive perception of danger was the most important question need to be solved in Danger Theory. Based on the mechanism that the physiological balance was protected by biological immune system, the balance mechanism was introduced into Danger Theory in order to realize that the danger can be adaptive found through looking for changing factors which may lead to the imbalance of information system. This paper started from the immune homeostasis theory to formally describe the various characteristics of system resource indicators by using a differential calculus the balance in the information system was described in the feature of resource occupy. Besides, it is given the explanation of its meaning and implementation. Finally, use SpyBot as an example to test the effectiveness of the proposed method. 