Adequate Environment for conducting security experiments and test under controlled, safe, repeatable and as-realistic-as-possible conditions, are a key element for the research and development of adequate security solutions and the training of security personnel and researchers. In this paper, a new large-scale network experimental environment for high-risk security research was put forward. The main idea was using isolated computing clusters to obtain high levels of scale, manageability and safety by heavily leveraging virtualization technology, separating experiment and control network and multilayer sanitization.