This paper introduces the status, problems, and future strategies of the traditional defense system and analyzes issues in the current protection structure. We then propose the trusted computing (TC) 3.0 strategy, which is an active defense architecture based on active immunity. Furthermore, we give an example of TC 3.0 in cloud computing and provide some suggestions on enforcing active defense.%本文介绍了传统防御体系建设的现状、问题及未来构建策略。通过对现有防御体系建设现状和存在问题的剖析，以及可信计算的演变历程，提出了用可信3.0构建主动防御体系的思想，进一步给出了可信3.0主动防御在云计算中的应用，并针对网络安全动态变化存在的问题给出了切实可行的主动防御实施建议。
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