A dot matrix coding and decoding method readable for mobile phones for product information was presented in order to realize anti-fake tracing of products. First, the product information was encoded correspondingly to generate unique identification information, as product information and dot matrix identification information were exclusively matched. Then, the information of the unique character or the digital sequence of the product was encoded to get the dot matrix image. On this basis, by scanning the bitmap image on the product packaging with the smart phone camera , combined with the technology of image processing including the image filtering denoising, binarization, contour extraction and other processing, the unique product coding information was obtained through decoding algorithm, with corresponding product information illustrated on smart phones. Compared with the existing technology, dot matrix images were painted on product packaging with variable data ink jet printing, which required no special labeling printing process and reading without one dedicated reading equipment and could realize mobile scanning.