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With the latest mobile Internet technology, in order to make it more convenient and easy for the traffic police to check the operation of the vehicles, a variety of computer vision algorithms are analyzed and studied. A license plate location technology based on K-means clustering is proposed. License plate area can be certain and located by color clustering analysis. Then, the license plate characters are segmented and recognized by the vertical projection technique and template matching method. The database which can store the character information of the license plate is developed by using SQlite. On this basis, a vehicle license plate recognition system based on smart hand-held device is developed. The system, which has good stability, can recognize the license plates through functional tests.