.whiteboard designs.The microscopic concepts of the theme of the ninth grade chemistry "the mystery of material composition", such as molecules, atoms, etc., are invisible to the naked eye, and there are few perceptual materials. Students have no perceptual knowledge, and they are very abstract. They are taught to teachers and students. Both bring certain difficulties. The use of whiteboards can display very abstract concepts, microscopic particles and the "materialization" of their motion states, which can fully stimulate students' interest in learning and desire for knowledge, for example, in the structure of teaching atoms, the hierarchical arrangement of electrons outside the atom. The law and the law of the outermost electronic movements lead to the conclusion that the chemical properties of the outermost electrons determine the elements. Previously, teachers were free to explain. Students used their imagination to teach and learn, or they showed a few wall charts. explain. With the help of the whiteboard, it is possible to simulate the motion state of the electrons outside the nucleus, especially the motion state of the outermost electrons. Another example is the dynamics of teaching chemical changes, simulating how water molecules split into hydrogen and oxygen atoms when water is energized, and how hydrogen and oxygen atoms combine to form a dynamic process of hydrogen and oxygen molecules; The microscopic essence of formation, etc., color animation not only simulates the process and conditions of molecular motion, but also attracts the attention of students, and makes rational inferences from the perception of images. If a certain sound and light effect is added, the microscopic particles become "entities", the abstract content is interpreted by the image, giving the students a real experience. The success breaks through the difficulties, grasps the key points, and is beneficial to the students' knowledge. Acceptance, improve students' understanding, teachers?? lectures,