A virus is a microorganism that is very small and can only be seen with an electronic microscope that infects cells of biological organisms. Viruses can only reproduce (live) in living cells by invading and utilizing these cells because viruses do not have the cellular equipment to reproduce independently. This research development method refers to the ADDIE model which has 4 stages, namely the Analysis, Design, Develop, and Implementation stages. This research and development stage is only up to the development stage. The results of the validation of the material experts and media experts both reached the percentage of 76% material experts and 78% media experts, with criteria quite valid. So it can be concluded that the development of a book based on the Kvisoft Flipbook Maker marei virus is seen from its validity level, which is quite feasible and can be used in ongoing learning. The purpose of this development is to develop biology book teaching materials based on Kvisoft Flipbook Maker, virus material as a learning medium and to determine the feasibility of Kvisoft Flipbook Maker based biology book teaching materials as learning media. Based on research results on validation by material experts and media experts. The material expert stated that the presentation was 76.25% with a fairly valid category and could be used with a few revisions, while the media expert got a presentation of 78 with a fairly valid category and could be used a little revision.