Abstract: Biology is a new subject in junior high school, which has a strong science. Therefore, in the actual learning process, it is inevitable to feel a certain degree of difficulty, which has a lot to do with the relative abstract knowledge points. Some of the content is only through the oral explanation of teachers, it is difficult to achieve the expected teaching effect, so the application of multimedia has become the best choice for many biology teachers. In this way, the relevant knowledge points not only become more concrete, but also easier to be understood by students, and students' ability to master knowledge points is constantly improving, which has a great role in promoting the improvement of teachers' teaching quality and classroom teaching efficiency.

Key words: Junior high school biology, Multimedia application, Teaching work