The "water course" in Tucao University refers to a series of problems such as some teaching contents in elective courses or public courses are relatively imprecise, teachers' lectures are not full, or teaching methods are too loose. These courses bring pressure to students' study, and students' interest in these courses is relatively low. This paper mainly describes the characteristics and phenomena of "water course" in colleges and universities in detail, and gives some countermeasures.

1, the teacher's class style is single and the content is outdated.

In the "water class", teachers often use the method of watching PPT, and the content of PPT is not updated frequently, which belongs to the old material that has remained unchanged for thousands of years. This way of class can neither stimulate students' interest in learning, nor bring about the collision of new knowledge and new ideas. This not only makes students feel bored, but also fails to satisfy their pursuit of professional knowledge.

2, relying on students to lecture independently, the teacher only comments.

In some "water classes", teachers tend to hand over teaching tasks to students and let them give lectures by themselves. The teacher gave a brief comment and a class passed. This teaching method makes students lose the opportunity to deeply understand knowledge. Students pay little attention to the lecture content, but do their own things below, whether it is learning other irrelevant knowledge or playing mobile phones.

3. Give priority to lectures or show off, lacking in substance.

Some teachers like to talk about their personal "glorious history" or family achievements in class, but these contents have nothing to do with the course. Although students may be interested in these topics, if the teacher only talks about these contents in each class, he will feel bored and disappointed. In order to fill the cognitive gap, college students are more willing to listen to the knowledge points related to the course told by the teacher.

College students need to invest more time and energy in class, but "water class" can't meet students' demand for knowledge, which makes them feel that their study time is wasted. Because the content and teaching methods of "water class" can't meet the learning needs of students, many students choose to do other things in class, such as playing mobile phones, which undoubtedly wastes their learning time and opportunities.