Lixiang Yang is an associate professor of the University of Chinese Academy of Sciences. His research interests include operating systems, compilers, and programming language. Recently, he and his team successfully developed a new operating system that aims to fundamentally solve the problem concerning the intrusion of illegal programs into computers. They set up two websites for hackers to perform the intrusion attack test. These addresses are ftp://203.198.128.163/and ftp://114.242.35.6/.