Network Security Situation Awareness (NSSA) helps security analysts to be aware of the actual security situation of their networks. But its adaptive control model and method remain a new research field that needs to be explored. In this paper, we presented a novel NSSA adaptive control model based on cognitive network. The model adopted circle cognitive structure composed of Monitor, Awareness, Decision and Execution (MADE). In the MADE cognitive circle, we described a fusion awareness method based on PSO-DS theory. The decision and execution strategies were also discussed briefly. The experiments prove that our model realizes the adaptive regulation of NSSA effectively and it also can be applied into other fields in order to develop automatic tools and devices.