The author claimed above that some people think sudents should be required to attend their classes by university, bud otherpeople do not agree with their point. Tested by so many gradruates, education in universities are successful and efficience becuse of so many classes they carefully provide. Classes in universities are not only useful in our graduates' work, but also in their daily life. Usually, in required classes, students could get skills and knowledge that will be useful in the future work, and in other clases, students could extend their knowledge to deal with things and problems in their daily life.It is very important for a university to require their students to attend classes. Students in department of Biology will get a full view about knowledges and techqunics used in biological research. In China, most of graduate students only take class in their first six months in their study to maintain their knowledge learned in their undergraduate studies, after that, they when to libraries to do basic researches. Sometims, students in other subjicts, for example, arts will tell you how to deal with problems in scientific ways. According to a survey by our University, 80 percent of these knowledge were got from selected classses. So, not only the required classes are important for students, but alos those selected classes. In order to form their students' good personality, univercities should riquire their studnets to attend classes.What is more, in most of Universities, students could choose selected classes that they are interested in. But most of the students who do not go to their selected class say that they do not lik the class or the professor. It is a controvercy for they choose their clases according to their interests, but they say they do not like them finally. They think that it is waste of time to attend classes that they do not like .However, what could they do with thoe "saved" time? According to my experience, they could not go places that too far away from school because there are only 2 or 3 hours to goAlthough there are things that are more important than classes in University,students could experience them in their spare time. It is efficiency not how much time you spend on that is the most important things. Knowledge could make you understand better and become 熟练 easier. So it is important for university to require their students to attend class.