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The marking method which based on intelligent mobile device can work fast without special equipment, reduce costs and increase the mobility of marking work. To solve the problem when using a mobile device for marking, such as shadows, reflections, tilted -45° to 45° and so on, this article designed and implemented a set of sheet automatic identification algorithm. The algorithm is mainly divided into three parts: image preprocessing, identify regional orientation and segmentation, sheet content recognition. Experimental results show in different operating systems (PC, Android, IOS): the recognition rate of the algorithm is 100%, and the detection rate of abnormal filling is 93.6%; the recognition speed is less than 2s, satisfying the real-time requirement; it can be compiled and run under different operating systems without modification, thus improving the universality and compatibility of the program.At present, this algorithm has been successfully applied to a education enterprise on-line APP.