This paper introduces how to achieve the car license recognition system, studies the principle of car license recognition, analyses the key technologies of car license recognition such as character segmentation and recognition. And how to use LabVIEW to realize a simple license recognition system has been discussed, which made the figure can be easily recognized from the license photograph. LabVIEW is a widely used software in automatic detection area, namely, machinery, communication, automobile making, biology, medicine, chemical industry and so on, it uses the graphic programming language to simplify exploitation process, so it is widely accepted by many people.