Is the graduation project. Graduation design means that every graduate writes a graduation thesis by using the knowledge he has learned four years before graduation. This paper needs to make an experimental expectation and operation design based on theory and facts, combined with other people's experience and his desired goal. Then, he will operate according to his own experimental design, record the operation results, remember the experimental results, analyze and draw conclusions, and then write a paper according to the whole experiment. In addition, he needs to make a ppt speech and accept the teacher's questions according to the paper.