To draw a virus, we need to understand its basic structure and morphology first, and then express its characteristics in a simplified way. Take novel coronavirus as an example, a circle can be used to represent the main body of the virus, and then lines can be used to outline the texture of the envelope, and different colors or shades can be used to represent the nucleic acid part. Finally, some medical elements can be added to emphasize the relationship between viruses and human cells. After painting, it can be shown to students for appreciation, and it can also be used for the knowledge of popular science viruses.