Written here, the graduation project is about to be completed. After several months of hard work and time payment, I am very proud of finally having such a small achievement, but I also found that I miss the knowledge I learned in school before is far from enough, there are many I don’t understand or understand the problem. I thank my tutors and students for their guidance and help. Then, after checking and searching for related books and materials, we finally have a preliminary idea. After several months of hard work, today’s newspaper finally wants to ended. At this time, I have mixed feelings. I think it is not easy to become an intellectual. To become a qualified design engineer, we still have a long way to go. We need to learn at work, learn at work, and grow at work, so that we can become useful people to society. With the help of teachers and classmates, I am most grateful to the teachers and classmates who have helped me in university research. It was with everyone's help that my paper was passed.