This invention is one kind of vehicle door opens when the danger early-warning installation, because of a microprocessor collection vehicle in signals of the many item of equipment, judges in the vehicle the driver or the passenger after whether to have drives intention of the gate, if has, then actuates a phantom identification unit movement, rear area the identification whether some people, the vehicle do want the process; Or actuates the rear view mirror to carry on the wide range rotation, for the driver because of the onlooking movement's in rear view mirror, further confirmed directly rear area whether some people, the vehicle do want the process; In addition, this invention may also after vehicle door lock opening, actuates the turn signal twinkle immediately, brings the full early warning effect for the rear incoming vehicle and the pedestrian, achieves promotes goal of the traffic safety.