WECO integrated 3D monitoring system is consist of two independent infrared sensing system ( 2D and 3D door detector),besides common 2D door detector protection system for all elevators, we increase a set of 3D door detector monitoring elevator inlet belt, achieve the 3D protection on the danger area when elevator hall door and car door are closing. During the elevator door closing procedure, 3D door detector would detect passengers move in front of the door and supply the signal to door controller, indicate to open the door to avoid passengers been hurt.