Examination is an indispensable way for students to verify their learning achievements and select talents. With the continuous development of computer technology, especially the emergence of answer sheets, computers have become the mainstream instead of manual examination. The main research content of this design is to use MATLAB software to identify and obtain the information in the answer sheet, import the completed answer sheet into the system, and use MATLAB software to preprocess the image to obtain an image that can be identified later. Through the system to identify the information in the answer card and compare the correct answers, finally realize the identification of the candidate's student number, identification of subjects, reminders of missing information, and calculation of scores and other functions. This article designed the GUI interface, which provided convenience for human-computer interaction, making the system operation more convenient and the results clear.