Point merge system(PMS)， a new approach flight procedure proposed by the European Control Experiment Center in 2006, has attracted extensive international attention. The design applications of point merge system are summarized in this paper. Firstly, the elements of point merge system are introduced and its design parameters are analyzed from the aspects of height, speed, angles and distance. Secondly, the global cases of point merge system are reviewed. The actual design parameters and design principles are explored and the implementation effect of point merge system is summarized. The future development trend of point merge system is speculated from multilayer point merge system, point merge system based on CDA and point merge system based on 4D track.