There are obvious differences between the computer examination pictures of food microbiology in Jiangnan University and the art pictures. Art picture is the author's observation and analysis of things from an artistic point of view. In the process of painting, the author not only considers the size and length of the picture, but also expresses the scenery through artistic means according to the experience and experience of screening the scenery. The biological map is that the author observes the drawn creatures from the perspective of scientific research, and the drawing must conform to the reality and seek truth from facts, and there must be no falsehood. Drawing a scientific biological map requires certain biological professional knowledge and artistic accomplishment. On the premise of science, we should pay attention to composition, brush strokes, light and shade or tone. The biological map drawn in this way is not only realistic, but also beautiful. Biomaps is mainly used for scientific research and teaching applications, and some of them should be exchanged and studied through printing and publishing. Therefore, drawing technology must meet the requirements of printing and plate making, which is embodied in the following four aspects. First, the line thickness should be regular, too thick, too thin or too dense does not meet the requirements. Ink color should not be uneven, and lines should not be omitted or merged. Second, the brightness of the image must be set off by the number of fine dots or thin lines, not by coloring. Third, the drawings should be clean and black and white. Fourth, the biological map should be reduced before making a plate. In order to make the image clear, it's better to draw twice the picture in the book.