Abstract: Space asset means any functional space object which is launched into outer space or assembled or manufactured in outer space, for civil or military purpose. Currently, space debris, harmful interference and anti-satellite weapons pose serious threat to space asset security. Many countries are very concerned with space asset security, but they have not been able to create special international rules for this purpose. Although the UN space treaties, the ITU treaties and Radio Regulations thereof, and PTBT to some extent, play an important role for the protection of space asset security, these rules cannot achieve the desired effect.