The utility model discloses a car designation system is reconnoitered in chemical defence, the on-vehicle information injector fixed mounting that marks are on the car is reconnoitered in the chemical defence, and the biochemical be contaminted sign information of nuclear that will reconnoiter is poured into into and is markd the flag, mark that the flag is put in to examining near biochemical be contaminted zone boundary, provide picture and text mark and light scintillation warning to the digitization of transmission storage marks information, mark that message sink is carried by the individual soldier, receive and show the information that marks that the flag sent that marks in the communication distance. The beneficial effects of the utility model are that provide picture and text mark and light scintillation warning to the digitization of transmission storage marks information, mark that message sink is carried by the individual soldier for maring the flag and receiving the demonstration in the discovery communication distance marks information.