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In the system of computer network collaborative defense(CNCD),defense agents newly added to the network lack of historical interaction for trust evaluation.To solve the problem of trust bootstrapping in CNCD,a trust type based trust bootstrapping model was introduced in this research.First,we discussed the division of trust type,and analyzed the trust utility and defense cost.Then the constraints of defense tasks were proposed based on the above analysis.According to the constraints obtained,we identified the trust type and assigned the initial trustworthiness to DAs.The simulated experiment shows that the methods proposed in the present work have lower failure rate of tasks and better adaptability.