【Objective】The current naturalized status of alien invasive flowers and their influence on green space of Nanchang were investigated and analyzed， after which corresponding prevention and control measures were proposed in order to provide references for monitoring and management of alien invasive flowers and landscape plant introduction in urban construction. 【Method】Documentary inquiry and field investigation were used to survey species and naturalized situation of alien invasive flowers in Nanchang. 【Result】A total of 26 alien invasive flower species belonging to 14 families was discovered， in which the dominant family was Compositae （42.31%）. A total of 24 species propagated by seed， and 11 species had asexual propagation ability. Most plants excluding 5 species were naturalized at various extents. 【Suggestion】Alien flowers introduction should be paid special attention so that biological invasion could be avoided. Monitoring and management of invasive alien flowers should be strengthened so that no plant or reproductive organs escape from cultivated places to grow and form populations in natural environments. The research of comprehensive control and utilization of alien flowers which escaped to become weeds should be intensified to minimize their damage to landscape and ecological environment.