Abstract: The three-dimensional virtual space and avatars of the metaverse will be attacked directly in cyberspace. Such attacks cause severe impacts such as users'property loss, avatars'loss of control and degrading of social efficiency. The traditional cybersecurity monitor and control architecture based on vulnerability database and the professional maintenance is difficult to deal with such problems, as vulnerable network resources of the metaverse and virtual social engineering attacks. A framework of parallel security system based on the parallel theory MetaSecurity is proposed, which will systematically solve the cybersecurity problem of metaverse by mapping the real cyberspace of metaverse through artificial cyberspace, experimenting with different cyberattacks and countermeasures in artificial cyberspace, and guiding the professionals and the agents to execute the countermeasures parallelly. MetaSecurity will reduce the professionals'workload and enhance the metaverses cybersecurity through the high efficiency cybersecurity countermeasure recommendations and automated execution. The initial exploration of MetaSecurity for unmanned mines demonstrates the application potential of metaverse. MetaSecurity can not only safeguard the cybersecurity of the metaverse but also can promote the innovation of traditional cybersecurity monitor and management and control.