Abstract: Virtual society has provided mankind with a new field of survival and development, changed the way of people's activities, and has formed new virtual activities mediated by "digital symbols", which has played a significant role in human development and social progress. However, in the process of the development of virtual society, the moral anomie of virtual activities has become increasingly prominent and the healthy development of virtual society has been seriously affected. Occurrence of moral anomie in virtual society psychological has its psychological reasons:speculation, adventure and curiosity etc. But there are social reasons as well:imperfect legislation and regulation, outdated moral construction and inadequate guidance on public opinions. Therefore, to strengthen the management of virtual society, we must take infective measures targeting the root causes of moral anomie to improve virtual society governance and netizens self-discipline.

Key words: virtual society, moral anomie, psychological reason, social reason, digital symbol